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3ea6acc072
All CoglBuffer constructors now take an explicit CoglContext constructor. This is part of the on going effort to adapt to Cogl API so it no longer depends on a global, default context. Reviewed-by: Neil Roberts <neil@linux.intel.com>
311 lines
10 KiB
C
311 lines
10 KiB
C
#include <cogl/cogl.h>
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#include <cogl-pango/cogl-pango.h>
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/* The state for this example... */
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typedef struct _Data
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{
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CoglFramebuffer *fb;
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int framebuffer_width;
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int framebuffer_height;
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CoglMatrix view;
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CoglIndices *indices;
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CoglPrimitive *prim;
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CoglTexture *texture;
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CoglPipeline *crate_pipeline;
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CoglPangoFontMap *pango_font_map;
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PangoContext *pango_context;
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PangoFontDescription *pango_font_desc;
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PangoLayout *hello_label;
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int hello_label_width;
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int hello_label_height;
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GTimer *timer;
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gboolean swap_ready;
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} Data;
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/* A static identity matrix initialized for convenience. */
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static CoglMatrix identity;
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/* static colors initialized for convenience. */
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static CoglColor white;
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/* A cube modelled using 4 vertices for each face.
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*
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* We use an index buffer when drawing the cube later so the GPU will
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* actually read each face as 2 separate triangles.
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*/
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static CoglVertexP3T2 vertices[] =
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{
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/* Front face */
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{ /* pos = */ -1.0f, -1.0f, 1.0f, /* tex coords = */ 0.0f, 1.0f},
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{ /* pos = */ 1.0f, -1.0f, 1.0f, /* tex coords = */ 1.0f, 1.0f},
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{ /* pos = */ 1.0f, 1.0f, 1.0f, /* tex coords = */ 1.0f, 0.0f},
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{ /* pos = */ -1.0f, 1.0f, 1.0f, /* tex coords = */ 0.0f, 0.0f},
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/* Back face */
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{ /* pos = */ -1.0f, -1.0f, -1.0f, /* tex coords = */ 1.0f, 0.0f},
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{ /* pos = */ -1.0f, 1.0f, -1.0f, /* tex coords = */ 1.0f, 1.0f},
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{ /* pos = */ 1.0f, 1.0f, -1.0f, /* tex coords = */ 0.0f, 1.0f},
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{ /* pos = */ 1.0f, -1.0f, -1.0f, /* tex coords = */ 0.0f, 0.0f},
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/* Top face */
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{ /* pos = */ -1.0f, 1.0f, -1.0f, /* tex coords = */ 0.0f, 1.0f},
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{ /* pos = */ -1.0f, 1.0f, 1.0f, /* tex coords = */ 0.0f, 0.0f},
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{ /* pos = */ 1.0f, 1.0f, 1.0f, /* tex coords = */ 1.0f, 0.0f},
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{ /* pos = */ 1.0f, 1.0f, -1.0f, /* tex coords = */ 1.0f, 1.0f},
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/* Bottom face */
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{ /* pos = */ -1.0f, -1.0f, -1.0f, /* tex coords = */ 1.0f, 1.0f},
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{ /* pos = */ 1.0f, -1.0f, -1.0f, /* tex coords = */ 0.0f, 1.0f},
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{ /* pos = */ 1.0f, -1.0f, 1.0f, /* tex coords = */ 0.0f, 0.0f},
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{ /* pos = */ -1.0f, -1.0f, 1.0f, /* tex coords = */ 1.0f, 0.0f},
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/* Right face */
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{ /* pos = */ 1.0f, -1.0f, -1.0f, /* tex coords = */ 1.0f, 0.0f},
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{ /* pos = */ 1.0f, 1.0f, -1.0f, /* tex coords = */ 1.0f, 1.0f},
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{ /* pos = */ 1.0f, 1.0f, 1.0f, /* tex coords = */ 0.0f, 1.0f},
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{ /* pos = */ 1.0f, -1.0f, 1.0f, /* tex coords = */ 0.0f, 0.0f},
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/* Left face */
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{ /* pos = */ -1.0f, -1.0f, -1.0f, /* tex coords = */ 0.0f, 0.0f},
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{ /* pos = */ -1.0f, -1.0f, 1.0f, /* tex coords = */ 1.0f, 0.0f},
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{ /* pos = */ -1.0f, 1.0f, 1.0f, /* tex coords = */ 1.0f, 1.0f},
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{ /* pos = */ -1.0f, 1.0f, -1.0f, /* tex coords = */ 0.0f, 1.0f}
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};
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static void
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paint (Data *data)
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{
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CoglFramebuffer *fb = data->fb;
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float rotation;
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cogl_framebuffer_clear4f (fb,
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COGL_BUFFER_BIT_COLOR|COGL_BUFFER_BIT_DEPTH,
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0, 0, 0, 1);
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cogl_framebuffer_push_matrix (fb);
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cogl_framebuffer_translate (fb,
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data->framebuffer_width / 2,
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data->framebuffer_height / 2,
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0);
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cogl_framebuffer_scale (fb, 75, 75, 75);
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/* Update the rotation based on the time the application has been
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running so that we get a linear animation regardless of the frame
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rate */
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rotation = g_timer_elapsed (data->timer, NULL) * 60.0f;
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/* Rotate the cube separately around each axis.
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*
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* Note: Cogl matrix manipulation follows the same rules as for
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* OpenGL. We use column-major matrices and - if you consider the
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* transformations happening to the model - then they are combined
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* in reverse order which is why the rotation is done last, since
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* we want it to be a rotation around the origin, before it is
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* scaled and translated.
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*/
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cogl_framebuffer_rotate (fb, rotation, 0, 0, 1);
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cogl_framebuffer_rotate (fb, rotation, 0, 1, 0);
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cogl_framebuffer_rotate (fb, rotation, 1, 0, 0);
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cogl_framebuffer_draw_primitive (fb, data->crate_pipeline, data->prim);
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cogl_framebuffer_pop_matrix (fb);
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/* And finally render our Pango layouts... */
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cogl_pango_render_layout (data->hello_label,
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(data->framebuffer_width / 2) -
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(data->hello_label_width / 2),
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(data->framebuffer_height / 2) -
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(data->hello_label_height / 2),
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&white, 0);
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}
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static void
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swap_notify_cb (CoglFramebuffer *framebuffer,
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void *user_data)
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{
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Data *data = user_data;
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data->swap_ready = TRUE;
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}
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int
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main (int argc, char **argv)
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{
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CoglContext *ctx;
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CoglOnscreen *onscreen;
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CoglFramebuffer *fb;
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GError *error = NULL;
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Data data;
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PangoRectangle hello_label_size;
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float fovy, aspect, z_near, z_2d, z_far;
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CoglDepthState depth_state;
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gboolean has_swap_notify;
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g_type_init ();
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ctx = cogl_context_new (NULL, &error);
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if (!ctx) {
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fprintf (stderr, "Failed to create context: %s\n", error->message);
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return 1;
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}
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onscreen = cogl_onscreen_new (ctx, 640, 480);
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fb = COGL_FRAMEBUFFER (onscreen);
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data.fb = fb;
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data.framebuffer_width = cogl_framebuffer_get_width (fb);
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data.framebuffer_height = cogl_framebuffer_get_height (fb);
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data.timer = g_timer_new ();
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cogl_onscreen_show (onscreen);
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cogl_push_framebuffer (fb);
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cogl_set_viewport (0, 0, data.framebuffer_width, data.framebuffer_height);
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fovy = 60; /* y-axis field of view */
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aspect = (float)data.framebuffer_width/(float)data.framebuffer_height;
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z_near = 0.1; /* distance to near clipping plane */
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z_2d = 1000; /* position to 2d plane */
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z_far = 2000; /* distance to far clipping plane */
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cogl_perspective (fovy, aspect, z_near, z_far);
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/* Since the pango renderer emits geometry in pixel/device coordinates
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* and the anti aliasing is implemented with the assumption that the
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* geometry *really* does end up pixel aligned, we setup a modelview
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* matrix so that for geometry in the plane z = 0 we exactly map x
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* coordinates in the range [0,stage_width] and y coordinates in the
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* range [0,stage_height] to the framebuffer extents with (0,0) being
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* the top left.
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*
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* This is roughly what Clutter does for a ClutterStage, but this
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* demonstrates how it is done manually using Cogl.
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*/
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cogl_matrix_init_identity (&data.view);
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cogl_matrix_view_2d_in_perspective (&data.view, fovy, aspect, z_near, z_2d,
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data.framebuffer_width,
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data.framebuffer_height);
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cogl_set_modelview_matrix (&data.view);
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cogl_pop_framebuffer ();
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/* Initialize some convenient constants */
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cogl_matrix_init_identity (&identity);
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cogl_color_set_from_4ub (&white, 0xff, 0xff, 0xff, 0xff);
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/* rectangle indices allow the GPU to interpret a list of quads (the
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* faces of our cube) as a list of triangles.
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*
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* Since this is a very common thing to do
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* cogl_get_rectangle_indices() is a convenience function for
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* accessing internal index buffers that can be shared.
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*/
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data.indices = cogl_get_rectangle_indices (ctx, 6 /* n_rectangles */);
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data.prim = cogl_primitive_new_p3t2 (ctx, COGL_VERTICES_MODE_TRIANGLES,
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G_N_ELEMENTS (vertices),
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vertices);
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/* Each face will have 6 indices so we have 6 * 6 indices in total... */
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cogl_primitive_set_indices (data.prim,
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data.indices,
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6 * 6);
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/* Load a jpeg crate texture from a file */
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printf ("crate.jpg (CC by-nc-nd http://bit.ly/9kP45T) ShadowRunner27 http://bit.ly/m1YXLh\n");
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data.texture = cogl_texture_new_from_file (COGL_EXAMPLES_DATA "crate.jpg",
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COGL_TEXTURE_NO_SLICING,
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COGL_PIXEL_FORMAT_ANY,
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NULL);
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if (!data.texture)
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g_error ("Failed to load texture");
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/* a CoglPipeline conceptually describes all the state for vertex
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* processing, fragment processing and blending geometry. When
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* drawing the geometry for the crate this pipeline says to sample a
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* single texture during fragment processing... */
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data.crate_pipeline = cogl_pipeline_new ();
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cogl_pipeline_set_layer_texture (data.crate_pipeline, 0, data.texture);
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/* Since the box is made of multiple triangles that will overlap
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* when drawn and we don't control the order they are drawn in, we
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* enable depth testing to make sure that triangles that shouldn't
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* be visible get culled by the GPU. */
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cogl_depth_state_init (&depth_state);
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cogl_depth_state_set_test_enabled (&depth_state, TRUE);
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cogl_pipeline_set_depth_state (data.crate_pipeline, &depth_state, NULL);
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/* Setup a Pango font map and context */
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data.pango_font_map = COGL_PANGO_FONT_MAP (cogl_pango_font_map_new());
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cogl_pango_font_map_set_use_mipmapping (data.pango_font_map, TRUE);
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data.pango_context = cogl_pango_font_map_create_context (data.pango_font_map);
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data.pango_font_desc = pango_font_description_new ();
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pango_font_description_set_family (data.pango_font_desc, "Sans");
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pango_font_description_set_size (data.pango_font_desc, 30 * PANGO_SCALE);
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/* Setup the "Hello Cogl" text */
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data.hello_label = pango_layout_new (data.pango_context);
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pango_layout_set_font_description (data.hello_label, data.pango_font_desc);
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pango_layout_set_text (data.hello_label, "Hello Cogl", -1);
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pango_layout_get_extents (data.hello_label, NULL, &hello_label_size);
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data.hello_label_width = PANGO_PIXELS (hello_label_size.width);
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data.hello_label_height = PANGO_PIXELS (hello_label_size.height);
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cogl_push_framebuffer (fb);
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data.swap_ready = TRUE;
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has_swap_notify =
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cogl_has_feature (ctx, COGL_FEATURE_ID_SWAP_BUFFERS_EVENT);
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if (has_swap_notify)
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cogl_framebuffer_add_swap_buffers_callback (fb,
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swap_notify_cb,
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&data);
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while (1)
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{
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CoglPollFD *poll_fds;
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int n_poll_fds;
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gint64 timeout;
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if (data.swap_ready)
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{
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paint (&data);
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cogl_framebuffer_swap_buffers (fb);
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}
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cogl_poll_get_info (ctx, &poll_fds, &n_poll_fds, &timeout);
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if (!has_swap_notify)
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{
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/* If the winsys doesn't support swap event notification
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then we'll just redraw constantly */
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data.swap_ready = TRUE;
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timeout = 0;
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}
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g_poll ((GPollFD *) poll_fds, n_poll_fds,
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timeout == -1 ? -1 : timeout / 1000);
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cogl_poll_dispatch (ctx, poll_fds, n_poll_fds);
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}
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return 0;
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}
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