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Add a simple example of stereo drawing
Add a new example that draws a triangle floating in the air in front of the screen. Reviewed-by: Robert Bragg <robert.bragg@intel.com>
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@ -33,7 +33,7 @@ cogl_info_SOURCES = cogl-info.c
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cogl_info_LDADD = $(common_ldadd)
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if USE_GLIB
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programs += cogl-hello cogl-msaa cogl-gles2-context cogl-point-sprites
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programs += cogl-hello cogl-msaa cogl-gles2-context cogl-point-sprites cogl-stereo
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examples_datadir = $(pkgdatadir)/examples-data
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examples_data_DATA =
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@ -43,6 +43,8 @@ cogl_msaa_SOURCES = cogl-msaa.c
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cogl_msaa_LDADD = $(common_ldadd)
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cogl_point_sprites_SOURCES = cogl-point-sprites.c
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cogl_point_sprites_LDADD = $(common_ldadd)
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cogl_stereo_SOURCES = cogl-stereo.c
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cogl_stereo_LDADD = $(common_ldadd)
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if BUILD_COGL_PANGO
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programs += cogl-crate
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152
examples/cogl-stereo.c
Normal file
152
examples/cogl-stereo.c
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@ -0,0 +1,152 @@
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#include <cogl/cogl.h>
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#include <glib.h>
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#include <stdio.h>
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typedef struct _Data
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{
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CoglContext *ctx;
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CoglFramebuffer *fb;
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CoglPrimitive *left_triangle;
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CoglPrimitive *right_triangle;
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CoglPipeline *pipeline;
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unsigned int redraw_idle;
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CoglBool is_dirty;
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CoglBool draw_ready;
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} Data;
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static gboolean
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paint_cb (void *user_data)
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{
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Data *data = user_data;
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data->redraw_idle = 0;
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data->is_dirty = FALSE;
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data->draw_ready = FALSE;
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cogl_framebuffer_set_stereo_mode (data->fb, COGL_STEREO_BOTH);
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cogl_framebuffer_clear4f (data->fb, COGL_BUFFER_BIT_COLOR, 0, 0, 0, 1);
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cogl_framebuffer_set_stereo_mode (data->fb, COGL_STEREO_LEFT);
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cogl_primitive_draw (data->left_triangle,
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data->fb,
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data->pipeline);
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if (cogl_framebuffer_get_is_stereo (data->fb))
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{
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cogl_framebuffer_set_stereo_mode (data->fb, COGL_STEREO_RIGHT);
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cogl_primitive_draw (data->right_triangle,
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data->fb,
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data->pipeline);
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}
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cogl_onscreen_swap_buffers (data->fb);
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return G_SOURCE_REMOVE;
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}
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static void
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maybe_redraw (Data *data)
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{
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if (data->is_dirty && data->draw_ready && data->redraw_idle == 0) {
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/* We'll draw on idle instead of drawing immediately so that
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* if Cogl reports multiple dirty rectangles we won't
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* redundantly draw multiple frames */
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data->redraw_idle = g_idle_add (paint_cb, data);
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}
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}
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static void
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frame_event_cb (CoglOnscreen *onscreen,
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CoglFrameEvent event,
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CoglFrameInfo *info,
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void *user_data)
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{
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Data *data = user_data;
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if (event == COGL_FRAME_EVENT_SYNC) {
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data->draw_ready = TRUE;
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maybe_redraw (data);
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}
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}
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static void
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dirty_cb (CoglOnscreen *onscreen,
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const CoglOnscreenDirtyInfo *info,
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void *user_data)
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{
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Data *data = user_data;
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data->is_dirty = TRUE;
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maybe_redraw (data);
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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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Data data;
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CoglRenderer *renderer;
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CoglOnscreenTemplate *onscreen_template;
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CoglDisplay *display;
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CoglOnscreen *onscreen;
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CoglError *error = NULL;
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CoglVertexP2C4 left_triangle_vertices[] = {
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{0.05, 0.7, 0xff, 0x00, 0x00, 0xff},
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{-0.65, -0.7, 0x00, 0xff, 0x00, 0xff},
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{0.75, -0.7, 0x00, 0x00, 0xff, 0xff}
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};
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CoglVertexP2C4 right_triangle_vertices[] = {
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{-0.05, 0.7, 0xff, 0x00, 0x00, 0xff},
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{-0.75, -0.7, 0x00, 0xff, 0x00, 0xff},
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{0.65, -0.7, 0x00, 0x00, 0xff, 0xff}
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};
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GSource *cogl_source;
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GMainLoop *loop;
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data.redraw_idle = 0;
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data.is_dirty = FALSE;
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data.draw_ready = TRUE;
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renderer = cogl_renderer_new ();
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onscreen_template = cogl_onscreen_template_new (NULL);
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cogl_onscreen_template_set_stereo_enabled (onscreen_template, TRUE);
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display = cogl_display_new (renderer, onscreen_template);
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data.ctx = cogl_context_new (display, &error);
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if (!data.ctx) {
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fprintf (stderr, "Failed to create stereo context: %s\n", error->message);
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return 1;
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}
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onscreen = cogl_onscreen_new (data.ctx, 640, 480);
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cogl_onscreen_show (onscreen);
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data.fb = onscreen;
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cogl_onscreen_set_resizable (onscreen, TRUE);
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data.left_triangle = cogl_primitive_new_p2c4 (data.ctx,
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COGL_VERTICES_MODE_TRIANGLES,
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3, left_triangle_vertices);
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data.right_triangle = cogl_primitive_new_p2c4 (data.ctx,
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COGL_VERTICES_MODE_TRIANGLES,
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3, right_triangle_vertices);
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data.pipeline = cogl_pipeline_new (data.ctx);
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cogl_source = cogl_glib_source_new (data.ctx, G_PRIORITY_DEFAULT);
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g_source_attach (cogl_source, NULL);
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cogl_onscreen_add_frame_callback (data.fb,
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frame_event_cb,
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&data,
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NULL); /* destroy notify */
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cogl_onscreen_add_dirty_callback (data.fb,
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dirty_cb,
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&data,
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NULL); /* destroy notify */
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loop = g_main_loop_new (NULL, TRUE);
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g_main_loop_run (loop);
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return 0;
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}
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