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framebuffer: Add CoglFramebuffer matrix stack methods
This adds cogl_framebuffer_ methods to update the modelview and projection matrix stacks to replace functions like cogl_translate(), cogl_rotate() and cogl_scale() etc. This is part of the on-going effort to get rid of the global CoglContext pointer since the existing methods don't take an explicit pointer to a CoglContext. All the methods are now related to a context via the framebuffer. We added framebuffer methods instead of direct context methods because the matrix stacks are per-framebuffer and as well as removing the global CoglContext we would rather aim for a more direct state access API design than, say, cairo or OpenGL, so we'd like to avoid needing the cogl_push/pop_framebuffer(). We anticipate that Cogl will mostly be consumed by middleware graphics layers such as toolkits or game engines and feel that a more stateless model will avoid impedance mismatches if higher levels want to expose a stateless model to their developers and statefullness can still be added by higher levels if really desired. Reviewed-by: Neil Roberts <neil@linux.intel.com>
This commit is contained in:
Robert Bragg
parent
595311ba55
commit
ccde191191
@ -40,6 +40,7 @@
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#include "cogl-journal-private.h"
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#include "cogl-winsys-private.h"
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#include "cogl-pipeline-state-private.h"
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#include "cogl-matrix-private.h"
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#ifndef GL_FRAMEBUFFER
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#define GL_FRAMEBUFFER 0x8D40
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@ -1779,3 +1780,175 @@ cogl_framebuffer_finish (CoglFramebuffer *framebuffer)
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_cogl_framebuffer_flush_journal (framebuffer);
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GE (framebuffer->context, glFinish ());
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}
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void
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cogl_framebuffer_push_matrix (CoglFramebuffer *framebuffer)
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{
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CoglMatrixStack *modelview_stack =
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_cogl_framebuffer_get_modelview_stack (framebuffer);
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_cogl_matrix_stack_push (modelview_stack);
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}
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void
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cogl_framebuffer_pop_matrix (CoglFramebuffer *framebuffer)
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{
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CoglMatrixStack *modelview_stack =
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_cogl_framebuffer_get_modelview_stack (framebuffer);
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_cogl_matrix_stack_pop (modelview_stack);
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}
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void
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cogl_framebuffer_scale (CoglFramebuffer *framebuffer,
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float x,
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float y,
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float z)
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{
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CoglMatrixStack *modelview_stack =
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_cogl_framebuffer_get_modelview_stack (framebuffer);
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_cogl_matrix_stack_scale (modelview_stack, x, y, z);
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}
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void
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cogl_framebuffer_translate (CoglFramebuffer *framebuffer,
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float x,
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float y,
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float z)
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{
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CoglMatrixStack *modelview_stack =
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_cogl_framebuffer_get_modelview_stack (framebuffer);
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_cogl_matrix_stack_translate (modelview_stack, x, y, z);
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}
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void
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cogl_framebuffer_rotate (CoglFramebuffer *framebuffer,
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float angle,
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float x,
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float y,
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float z)
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{
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CoglMatrixStack *modelview_stack =
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_cogl_framebuffer_get_modelview_stack (framebuffer);
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_cogl_matrix_stack_rotate (modelview_stack, angle, x, y, z);
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}
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void
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cogl_framebuffer_transform (CoglFramebuffer *framebuffer,
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const CoglMatrix *matrix)
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{
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CoglMatrixStack *modelview_stack =
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_cogl_framebuffer_get_modelview_stack (framebuffer);
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_cogl_matrix_stack_multiply (modelview_stack, matrix);
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}
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void
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cogl_framebuffer_perspective (CoglFramebuffer *framebuffer,
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float fov_y,
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float aspect,
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float z_near,
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float z_far)
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{
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float ymax = z_near * tanf (fov_y * G_PI / 360.0);
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cogl_framebuffer_frustum (framebuffer,
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-ymax * aspect, /* left */
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ymax * aspect, /* right */
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-ymax, /* bottom */
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ymax, /* top */
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z_near,
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z_far);
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}
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void
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cogl_framebuffer_frustum (CoglFramebuffer *framebuffer,
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float left,
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float right,
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float bottom,
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float top,
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float z_near,
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float z_far)
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{
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CoglMatrixStack *projection_stack =
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_cogl_framebuffer_get_projection_stack (framebuffer);
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/* XXX: The projection matrix isn't currently tracked in the journal
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* so we need to flush all journaled primitives first... */
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_cogl_framebuffer_flush_journal (framebuffer);
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_cogl_matrix_stack_load_identity (projection_stack);
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_cogl_matrix_stack_frustum (projection_stack,
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left,
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right,
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bottom,
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top,
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z_near,
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z_far);
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}
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void
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cogl_framebuffer_orthographic (CoglFramebuffer *framebuffer,
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float x_1,
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float y_1,
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float x_2,
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float y_2,
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float near,
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float far)
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{
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CoglMatrix ortho;
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CoglMatrixStack *projection_stack =
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_cogl_framebuffer_get_projection_stack (framebuffer);
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/* XXX: The projection matrix isn't currently tracked in the journal
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* so we need to flush all journaled primitives first... */
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_cogl_framebuffer_flush_journal (framebuffer);
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cogl_matrix_init_identity (&ortho);
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cogl_matrix_orthographic (&ortho, x_1, y_1, x_2, y_2, near, far);
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_cogl_matrix_stack_set (projection_stack, &ortho);
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}
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void
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cogl_framebuffer_get_modelview_matrix (CoglFramebuffer *framebuffer,
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CoglMatrix *matrix)
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{
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CoglMatrixStack *modelview_stack =
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_cogl_framebuffer_get_modelview_stack (framebuffer);
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_cogl_matrix_stack_get (modelview_stack, matrix);
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_COGL_MATRIX_DEBUG_PRINT (matrix);
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}
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void
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cogl_framebuffer_set_modelview_matrix (CoglFramebuffer *framebuffer,
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CoglMatrix *matrix)
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{
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CoglMatrixStack *modelview_stack =
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_cogl_framebuffer_get_modelview_stack (framebuffer);
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_cogl_matrix_stack_set (modelview_stack, matrix);
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_COGL_MATRIX_DEBUG_PRINT (matrix);
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}
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void
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cogl_framebuffer_get_projection_matrix (CoglFramebuffer *framebuffer,
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CoglMatrix *matrix)
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{
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CoglMatrixStack *projection_stack =
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_cogl_framebuffer_get_projection_stack (framebuffer);
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_cogl_matrix_stack_get (projection_stack, matrix);
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_COGL_MATRIX_DEBUG_PRINT (matrix);
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}
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void
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cogl_framebuffer_set_projection_matrix (CoglFramebuffer *framebuffer,
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CoglMatrix *matrix)
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{
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CoglMatrixStack *projection_stack =
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_cogl_framebuffer_get_projection_stack (framebuffer);
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/* XXX: The projection matrix isn't currently tracked in the journal
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* so we need to flush all journaled primitives first... */
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_cogl_framebuffer_flush_journal (framebuffer);
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_cogl_matrix_stack_set (projection_stack, matrix);
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_COGL_MATRIX_DEBUG_PRINT (matrix);
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}
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@ -127,6 +127,249 @@ void
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cogl_framebuffer_get_viewport4fv (CoglFramebuffer *framebuffer,
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float *viewport);
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#define cogl_framebuffer_push_matrix cogl_framebuffer_push_matrix_EXP
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/**
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* cogl_framebuffer_push_matrix:
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* @framebuffer: A #CoglFramebuffer pointer
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*
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* Copies the current model-view matrix onto the matrix stack. The matrix
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* can later be restored with cogl_framebuffer_pop_matrix().
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*
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* Since: 1.10
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*/
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void
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cogl_framebuffer_push_matrix (CoglFramebuffer *framebuffer);
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#define cogl_framebuffer_pop_matrix cogl_framebuffer_pop_matrix_EXP
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/**
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* cogl_framebuffer_pop_matrix:
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* @framebuffer: A #CoglFramebuffer pointer
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*
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* Restores the model-view matrix on the top of the matrix stack.
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*
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* Since: 1.10
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*/
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void
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cogl_framebuffer_pop_matrix (CoglFramebuffer *framebuffer);
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#define cogl_framebuffer_scale cogl_framebuffer_scale_EXP
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/**
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* cogl_framebuffer_scale:
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* @framebuffer: A #CoglFramebuffer pointer
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* @x: Amount to scale along the x-axis
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* @y: Amount to scale along the y-axis
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* @z: Amount to scale along the z-axis
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*
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* Multiplies the current model-view matrix by one that scales the x,
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* y and z axes by the given values.
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*
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* Since: 1.10
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*/
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void
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cogl_framebuffer_scale (CoglFramebuffer *framebuffer,
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float x,
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float y,
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float z);
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#define cogl_framebuffer_translate cogl_framebuffer_translate_EXP
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/**
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* cogl_framebuffer_translate:
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* @framebuffer: A #CoglFramebuffer pointer
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* @x: Distance to translate along the x-axis
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* @y: Distance to translate along the y-axis
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* @z: Distance to translate along the z-axis
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*
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* Multiplies the current model-view matrix by one that translates the
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* model along all three axes according to the given values.
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*
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* Since: 1.10
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*/
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void
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cogl_framebuffer_translate (CoglFramebuffer *framebuffer,
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float x,
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float y,
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float z);
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#define cogl_framebuffer_rotate cogl_framebuffer_rotate_EXP
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/**
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* cogl_framebuffer_rotate:
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* @framebuffer: A #CoglFramebuffer pointer
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* @angle: Angle in degrees to rotate.
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* @x: X-component of vertex to rotate around.
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* @y: Y-component of vertex to rotate around.
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* @z: Z-component of vertex to rotate around.
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*
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* Multiplies the current model-view matrix by one that rotates the
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* model around the vertex specified by @x, @y and @z. The rotation
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* follows the right-hand thumb rule so for example rotating by 10
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* degrees about the vertex (0, 0, 1) causes a small counter-clockwise
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* rotation.
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*
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* Since: 1.10
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*/
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void
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cogl_framebuffer_rotate (CoglFramebuffer *framebuffer,
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float angle,
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float x,
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float y,
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float z);
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#define cogl_framebuffer_transform cogl_framebuffer_transform_EXP
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/**
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* cogl_framebuffer_transform:
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* @framebuffer: A #CoglFramebuffer pointer
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* @matrix: the matrix to multiply with the current model-view
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*
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* Multiplies the current model-view matrix by the given matrix.
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*
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* Since: 1.10
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*/
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void
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cogl_framebuffer_transform (CoglFramebuffer *framebuffer,
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const CoglMatrix *matrix);
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#define cogl_framebuffer_get_modelview_matrix \
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cogl_framebuffer_get_modelview_matrix_EXP
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/**
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* cogl_framebuffer_get_modelview_matrix:
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* @framebuffer: A #CoglFramebuffer pointer
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* @matrix: (out): return location for the model-view matrix
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*
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* Stores the current model-view matrix in @matrix.
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*
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* Since: 1.10
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*/
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void
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cogl_framebuffer_get_modelview_matrix (CoglFramebuffer *framebuffer,
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CoglMatrix *matrix);
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#define cogl_framebuffer_set_modelview_matrix \
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cogl_framebuffer_set_modelview_matrix_EXP
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/**
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* cogl_framebuffer_set_modelview_matrix:
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* @framebuffer: A #CoglFramebuffer pointer
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* @matrix: the new model-view matrix
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*
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* Sets @matrix as the new model-view matrix.
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*
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* Since: 1.10
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*/
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void
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cogl_framebuffer_set_modelview_matrix (CoglFramebuffer *framebuffer,
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CoglMatrix *matrix);
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#define cogl_framebuffer_perspective cogl_framebuffer_perspective_EXP
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/**
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* cogl_framebuffer_perspective:
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* @framebuffer: A #CoglFramebuffer pointer
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* @fovy: Vertical field of view angle in degrees.
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* @aspect: The (width over height) aspect ratio for display
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* @z_near: The distance to the near clipping plane (Must be positive,
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* and must not be 0)
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* @z_far: The distance to the far clipping plane (Must be positive)
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*
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* Replaces the current projection matrix with a perspective matrix
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* based on the provided values.
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*
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* <note>You should be careful not to have to great a @z_far / @z_near
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* ratio since that will reduce the effectiveness of depth testing
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* since there wont be enough precision to identify the depth of
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* objects near to each other.</note>
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*
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* Since: 1.10
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*/
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void
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cogl_framebuffer_perspective (CoglFramebuffer *framebuffer,
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float fov_y,
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float aspect,
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float z_near,
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float z_far);
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#define cogl_framebuffer_frustum cogl_framebuffer_frustum_EXP
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/**
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* cogl_framebuffer_frustum:
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* @framebuffer: A #CoglFramebuffer pointer
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* @left: X position of the left clipping plane where it
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* intersects the near clipping plane
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* @right: X position of the right clipping plane where it
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* intersects the near clipping plane
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* @bottom: Y position of the bottom clipping plane where it
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* intersects the near clipping plane
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* @top: Y position of the top clipping plane where it intersects
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* the near clipping plane
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* @z_near: The distance to the near clipping plane (Must be positive)
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* @z_far: The distance to the far clipping plane (Must be positive)
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*
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* Replaces the current projection matrix with a perspective matrix
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* for a given viewing frustum defined by 4 side clip planes that
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* all cross through the origin and 2 near and far clip planes.
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*
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* Since: 1.10
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*/
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void
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cogl_framebuffer_frustum (CoglFramebuffer *framebuffer,
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float left,
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float right,
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float bottom,
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float top,
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float z_near,
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float z_far);
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#define cogl_framebuffer_orthographic cogl_framebuffer_orthographic_EXP
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/**
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* cogl_framebuffer_orthographic:
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* @framebuffer: A #CoglFramebuffer pointer
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* @x_1: The x coordinate for the first vertical clipping plane
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* @y_1: The y coordinate for the first horizontal clipping plane
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* @x_2: The x coordinate for the second vertical clipping plane
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* @y_2: The y coordinate for the second horizontal clipping plane
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* @near: The <emphasis>distance</emphasis> to the near clipping
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* plane (will be <emphasis>negative</emphasis> if the plane is
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* behind the viewer)
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* @far: The <emphasis>distance</emphasis> to the far clipping
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* plane (will be <emphasis>negative</emphasis> if the plane is
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* behind the viewer)
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*
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* Replaces the current projection matrix with an orthographic projection
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* matrix.
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*
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* Since: 1.0
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*/
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void
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cogl_framebuffer_orthographic (CoglFramebuffer *framebuffer,
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float x_1,
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float y_1,
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float x_2,
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float y_2,
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float near,
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float far);
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#define cogl_framebuffer_get_projection_matrix \
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cogl_framebuffer_get_projection_matrix
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/**
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* cogl_framebuffer_get_projection_matrix:
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* @framebuffer: A #CoglFramebuffer pointer
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* @matrix: (out): return location for the projection matrix
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*
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* Stores the current projection matrix in @matrix.
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*/
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void
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cogl_framebuffer_get_projection_matrix (CoglFramebuffer *framebuffer,
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CoglMatrix *matrix);
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#define cogl_framebuffer_set_projection_matrix \
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cogl_framebuffer_set_projection_matrix
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/**
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* cogl_set_projection_matrix:
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* @framebuffer: A #CoglFramebuffer pointer
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* @matrix: the new projection matrix
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*
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* Sets @matrix as the new projection matrix.
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*/
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void
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cogl_framebuffer_set_projection_matrix (CoglFramebuffer *framebuffer,
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CoglMatrix *matrix);
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/**
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* cogl_framebuffer_get_red_bits:
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* @framebuffer: a pointer to a #CoglFramebuffer
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99
cogl/cogl.c
99
cogl/cogl.c
@ -722,49 +722,37 @@ cogl_end_gl (void)
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void
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cogl_push_matrix (void)
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{
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CoglMatrixStack *modelview_stack =
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_cogl_framebuffer_get_modelview_stack (cogl_get_draw_framebuffer ());
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_cogl_matrix_stack_push (modelview_stack);
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cogl_framebuffer_push_matrix (cogl_get_draw_framebuffer ());
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}
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void
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cogl_pop_matrix (void)
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{
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CoglMatrixStack *modelview_stack =
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_cogl_framebuffer_get_modelview_stack (cogl_get_draw_framebuffer ());
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_cogl_matrix_stack_pop (modelview_stack);
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cogl_framebuffer_pop_matrix (cogl_get_draw_framebuffer ());
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}
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void
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cogl_scale (float x, float y, float z)
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{
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CoglMatrixStack *modelview_stack =
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_cogl_framebuffer_get_modelview_stack (cogl_get_draw_framebuffer ());
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_cogl_matrix_stack_scale (modelview_stack, x, y, z);
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cogl_framebuffer_scale (cogl_get_draw_framebuffer (), x, y, z);
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}
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void
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cogl_translate (float x, float y, float z)
|
||||
{
|
||||
CoglMatrixStack *modelview_stack =
|
||||
_cogl_framebuffer_get_modelview_stack (cogl_get_draw_framebuffer ());
|
||||
_cogl_matrix_stack_translate (modelview_stack, x, y, z);
|
||||
cogl_framebuffer_translate (cogl_get_draw_framebuffer (), x, y, z);
|
||||
}
|
||||
|
||||
void
|
||||
cogl_rotate (float angle, float x, float y, float z)
|
||||
{
|
||||
CoglMatrixStack *modelview_stack =
|
||||
_cogl_framebuffer_get_modelview_stack (cogl_get_draw_framebuffer ());
|
||||
_cogl_matrix_stack_rotate (modelview_stack, angle, x, y, z);
|
||||
cogl_framebuffer_rotate (cogl_get_draw_framebuffer (), angle, x, y, z);
|
||||
}
|
||||
|
||||
void
|
||||
cogl_transform (const CoglMatrix *matrix)
|
||||
{
|
||||
CoglMatrixStack *modelview_stack =
|
||||
_cogl_framebuffer_get_modelview_stack (cogl_get_draw_framebuffer ());
|
||||
_cogl_matrix_stack_multiply (modelview_stack, matrix);
|
||||
cogl_framebuffer_transform (cogl_get_draw_framebuffer (), matrix);
|
||||
}
|
||||
|
||||
void
|
||||
@ -773,14 +761,8 @@ cogl_perspective (float fov_y,
|
||||
float z_near,
|
||||
float z_far)
|
||||
{
|
||||
float ymax = z_near * tanf (fov_y * G_PI / 360.0);
|
||||
|
||||
cogl_frustum (-ymax * aspect, /* left */
|
||||
ymax * aspect, /* right */
|
||||
-ymax, /* bottom */
|
||||
ymax, /* top */
|
||||
z_near,
|
||||
z_far);
|
||||
cogl_framebuffer_perspective (cogl_get_draw_framebuffer (),
|
||||
fov_y, aspect, z_near, z_far);
|
||||
}
|
||||
|
||||
void
|
||||
@ -791,24 +773,8 @@ cogl_frustum (float left,
|
||||
float z_near,
|
||||
float z_far)
|
||||
{
|
||||
CoglMatrixStack *projection_stack =
|
||||
_cogl_framebuffer_get_projection_stack (cogl_get_draw_framebuffer ());
|
||||
|
||||
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
|
||||
|
||||
/* XXX: The projection matrix isn't currently tracked in the journal
|
||||
* so we need to flush all journaled primitives first... */
|
||||
cogl_flush ();
|
||||
|
||||
_cogl_matrix_stack_load_identity (projection_stack);
|
||||
|
||||
_cogl_matrix_stack_frustum (projection_stack,
|
||||
left,
|
||||
right,
|
||||
bottom,
|
||||
top,
|
||||
z_near,
|
||||
z_far);
|
||||
cogl_framebuffer_frustum (cogl_get_draw_framebuffer (),
|
||||
left, right, bottom, top, z_near, z_far);
|
||||
}
|
||||
|
||||
void
|
||||
@ -816,64 +782,35 @@ cogl_ortho (float left,
|
||||
float right,
|
||||
float bottom,
|
||||
float top,
|
||||
float z_near,
|
||||
float z_far)
|
||||
float near,
|
||||
float far)
|
||||
{
|
||||
CoglMatrix ortho;
|
||||
CoglMatrixStack *projection_stack =
|
||||
_cogl_framebuffer_get_projection_stack (cogl_get_draw_framebuffer ());
|
||||
|
||||
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
|
||||
|
||||
/* XXX: The projection matrix isn't currently tracked in the journal
|
||||
* so we need to flush all journaled primitives first... */
|
||||
cogl_flush ();
|
||||
|
||||
cogl_matrix_init_identity (&ortho);
|
||||
cogl_matrix_ortho (&ortho, left, right, bottom, top, z_near, z_far);
|
||||
_cogl_matrix_stack_set (projection_stack, &ortho);
|
||||
cogl_framebuffer_orthographic (cogl_get_draw_framebuffer (),
|
||||
left, top, right, bottom, near, far);
|
||||
}
|
||||
|
||||
void
|
||||
cogl_get_modelview_matrix (CoglMatrix *matrix)
|
||||
{
|
||||
CoglMatrixStack *modelview_stack =
|
||||
_cogl_framebuffer_get_modelview_stack (cogl_get_draw_framebuffer ());
|
||||
_cogl_matrix_stack_get (modelview_stack, matrix);
|
||||
_COGL_MATRIX_DEBUG_PRINT (matrix);
|
||||
cogl_framebuffer_get_modelview_matrix (cogl_get_draw_framebuffer (), matrix);
|
||||
}
|
||||
|
||||
void
|
||||
cogl_set_modelview_matrix (CoglMatrix *matrix)
|
||||
{
|
||||
CoglMatrixStack *modelview_stack =
|
||||
_cogl_framebuffer_get_modelview_stack (cogl_get_draw_framebuffer ());
|
||||
_cogl_matrix_stack_set (modelview_stack, matrix);
|
||||
_COGL_MATRIX_DEBUG_PRINT (matrix);
|
||||
cogl_framebuffer_set_modelview_matrix (cogl_get_draw_framebuffer (), matrix);
|
||||
}
|
||||
|
||||
void
|
||||
cogl_get_projection_matrix (CoglMatrix *matrix)
|
||||
{
|
||||
CoglMatrixStack *projection_stack =
|
||||
_cogl_framebuffer_get_projection_stack (cogl_get_draw_framebuffer ());
|
||||
_cogl_matrix_stack_get (projection_stack, matrix);
|
||||
_COGL_MATRIX_DEBUG_PRINT (matrix);
|
||||
cogl_framebuffer_get_projection_matrix (cogl_get_draw_framebuffer (), matrix);
|
||||
}
|
||||
|
||||
void
|
||||
cogl_set_projection_matrix (CoglMatrix *matrix)
|
||||
{
|
||||
CoglMatrixStack *projection_stack =
|
||||
_cogl_framebuffer_get_projection_stack (cogl_get_draw_framebuffer ());
|
||||
|
||||
/* XXX: The projection matrix isn't currently tracked in the journal
|
||||
* so we need to flush all journaled primitives first... */
|
||||
cogl_flush ();
|
||||
|
||||
_cogl_matrix_stack_set (projection_stack, matrix);
|
||||
|
||||
_COGL_MATRIX_DEBUG_PRINT (matrix);
|
||||
cogl_framebuffer_set_projection_matrix (cogl_get_draw_framebuffer (), matrix);
|
||||
}
|
||||
|
||||
CoglClipState *
|
||||
|
||||
Loading…
Reference in New Issue
Block a user