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viewport: consistently use floats for viewports

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OpenGL < 4.0 only supports integer based viewports and internally we
have a mixture of code using floats and integers for viewports. This
patch switches all viewports throughout clutter and cogl to be
represented using floats considering that in the future we may want to
take advantage of floating point viewports with modern hardware/drivers.
This commit is contained in:
Robert Bragg 2011-02-01 16:51:58 +00:00
parent b3d9f313d4
commit bc372d2734
8 changed files with 39 additions and 44 deletions
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26
cogl/cogl-framebuffer-private.h
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@ -46,10 +46,10 @@ struct _CoglFramebuffer
CoglMatrixStack *modelview_stack;
CoglMatrixStack *projection_stack;
int viewport_x;
int viewport_y;
int viewport_width;
int viewport_height;
float viewport_x;
float viewport_y;
float viewport_width;
float viewport_height;
CoglClipState clip_state;
@ -173,25 +173,25 @@ _cogl_framebuffer_set_clip_stack (CoglFramebuffer *framebuffer,
void
_cogl_framebuffer_set_viewport (CoglFramebuffer *framebuffer,
int x,
int y,
int width,
int height);
int
float x,
float y,
float width,
float height);
float
_cogl_framebuffer_get_viewport_x (CoglFramebuffer *framebuffer);
int
float
_cogl_framebuffer_get_viewport_y (CoglFramebuffer *framebuffer);
int
float
_cogl_framebuffer_get_viewport_width (CoglFramebuffer *framebuffer);
int
float
_cogl_framebuffer_get_viewport_height (CoglFramebuffer *framebuffer);
void
_cogl_framebuffer_get_viewport4fv (CoglFramebuffer *framebuffer,
int *viewport);
float *viewport);
CoglMatrixStack *
_cogl_framebuffer_get_modelview_stack (CoglFramebuffer *framebuffer);

23
cogl/cogl-framebuffer.c
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@ -499,10 +499,10 @@ _cogl_framebuffer_set_clip_stack (CoglFramebuffer *framebuffer,
void
_cogl_framebuffer_set_viewport (CoglFramebuffer *framebuffer,
int x,
int y,
int width,
int height)
float x,
float y,
float width,
float height)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
@ -523,32 +523,33 @@ _cogl_framebuffer_set_viewport (CoglFramebuffer *framebuffer,
ctx->dirty_gl_viewport = TRUE;
}
int
float
_cogl_framebuffer_get_viewport_x (CoglFramebuffer *framebuffer)
{
return framebuffer->viewport_x;
}
int
float
_cogl_framebuffer_get_viewport_y (CoglFramebuffer *framebuffer)
{
return framebuffer->viewport_y;
}
int
float
_cogl_framebuffer_get_viewport_width (CoglFramebuffer *framebuffer)
{
return framebuffer->viewport_width;
}
int
float
_cogl_framebuffer_get_viewport_height (CoglFramebuffer *framebuffer)
{
return framebuffer->viewport_height;
}
void
_cogl_framebuffer_get_viewport4fv (CoglFramebuffer *framebuffer, int *viewport)
_cogl_framebuffer_get_viewport4fv (CoglFramebuffer *framebuffer,
float *viewport)
{
viewport[0] = framebuffer->viewport_x;
viewport[1] = framebuffer->viewport_y;
@ -1290,7 +1291,7 @@ _cogl_framebuffer_flush_state (CoglFramebuffer *draw_buffer,
if (ctx->dirty_gl_viewport)
{
int gl_viewport_y;
float gl_viewport_y;
/* Convert the Cogl viewport y offset to an OpenGL viewport y offset
* NB: OpenGL defines its window and viewport origins to be bottom
@ -1303,7 +1304,7 @@ _cogl_framebuffer_flush_state (CoglFramebuffer *draw_buffer,
gl_viewport_y = draw_buffer->height -
(draw_buffer->viewport_y + draw_buffer->viewport_height);
COGL_NOTE (OPENGL, "Calling glViewport(%d, %d, %d, %d)",
COGL_NOTE (OPENGL, "Calling glViewport(%f, %f, %f, %f)",
draw_buffer->viewport_x,
gl_viewport_y,
draw_buffer->viewport_width,

2
cogl/cogl-journal.c
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@ -1552,7 +1552,7 @@ entry_to_screen_polygon (const CoglJournalEntry *entry,
CoglMatrixStack *projection_stack;
CoglMatrix projection;
int i;
int viewport[4];
float viewport[4];
poly[0] = vertices[0];
poly[1] = vertices[1];

8
cogl/cogl-matrix-mesa.c
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@ -1251,13 +1251,15 @@ _math_matrix_translate (CoglMatrix *matrix, float x, float y, float z)
* Transforms Normalized Device Coords to window/Z values.
*/
void
_math_matrix_viewport (CoglMatrix *matrix, int x, int y, int width, int height,
_math_matrix_viewport (CoglMatrix *matrix,
float x, float y,
float width, float height,
float zNear, float zFar, float depthMax)
{
float *m = (float *)matrix;
m[MAT_SX] = (float)width / 2.0f;
m[MAT_SX] = width / 2.0f;
m[MAT_TX] = m[MAT_SX] + x;
m[MAT_SY] = (float) height / 2.0f;
m[MAT_SY] = height / 2.0f;
m[MAT_TY] = m[MAT_SY] + y;
m[MAT_SZ] = depthMax * ((zFar - zNear) / 2.0f);
m[MAT_TZ] = depthMax * ((zFar - zNear) / 2.0f + zNear);

2
cogl/cogl-matrix-mesa.h
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@ -134,7 +134,7 @@ _math_matrix_frustum (CoglMatrix *matrix,
void
_math_matrix_viewport (CoglMatrix *matrix,
int x, int y, int width, int height,
float x, float y, float width, float height,
float z_near, float z_far, float depth_max);
void

12
cogl/cogl-texture.c
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@ -929,7 +929,7 @@ cogl_texture_set_region (CoglHandle handle,
static void
do_texture_draw_and_read (CoglHandle handle,
CoglBitmap *target_bmp,
GLint *viewport)
float *viewport)
{
int bpp;
float rx1, ry1;
@ -1036,7 +1036,7 @@ _cogl_texture_draw_and_read (CoglHandle handle,
{
int bpp;
CoglFramebuffer *framebuffer;
int viewport[4];
float viewport[4];
CoglBitmap *alpha_bmp;
CoglMatrixStack *projection_stack;
CoglMatrixStack *modelview_stack;
@ -1064,10 +1064,10 @@ _cogl_texture_draw_and_read (CoglHandle handle,
_cogl_matrix_stack_push (projection_stack);
_cogl_matrix_stack_load_identity (projection_stack);
_cogl_matrix_stack_ortho (projection_stack,
0, (float)(viewport[2]),
(float)(viewport[3]), 0,
(float)(0),
(float)(100));
0, viewport[2],
viewport[3], 0,
0,
100);
modelview_stack = _cogl_framebuffer_get_modelview_stack (framebuffer);
_cogl_matrix_stack_push (modelview_stack);

7
cogl/cogl.c
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@ -407,19 +407,14 @@ _cogl_features_available_private (CoglFeatureFlagsPrivate features)
* _cogl_framebuffer_get_viewport* functions public.
*/
void
cogl_get_viewport (float v[4])
cogl_get_viewport (float viewport[4])
{
CoglFramebuffer *framebuffer;
int viewport[4];
int i;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
framebuffer = _cogl_get_draw_buffer ();
_cogl_framebuffer_get_viewport4fv (framebuffer, viewport);
for (i = 0; i < 4; i++)
v[i] = viewport[i];
}
void

3
cogl/cogl.h
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@ -1281,9 +1281,6 @@ _cogl_check_extension (const char *name, const char *ext);
void
_cogl_set_indirect_context (gboolean indirect);
void
_cogl_set_viewport (int x, int y, int width, int height);
gboolean
_cogl_check_driver_valid (GError **error);