From 1b5beef5e58f3da80751141f50e7e2c2bc18d548 Mon Sep 17 00:00:00 2001 From: "Owen W. Taylor" Date: Thu, 1 May 2014 20:35:10 -0400 Subject: [PATCH] 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 --- examples/Makefile.am | 4 +- examples/cogl-stereo.c | 152 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 155 insertions(+), 1 deletion(-) create mode 100644 examples/cogl-stereo.c diff --git a/examples/Makefile.am b/examples/Makefile.am index b7cccec43..01cf003e3 100644 --- a/examples/Makefile.am +++ b/examples/Makefile.am @@ -33,7 +33,7 @@ cogl_info_SOURCES = cogl-info.c cogl_info_LDADD = $(common_ldadd) if USE_GLIB -programs += cogl-hello cogl-msaa cogl-gles2-context cogl-point-sprites +programs += cogl-hello cogl-msaa cogl-gles2-context cogl-point-sprites cogl-stereo examples_datadir = $(pkgdatadir)/examples-data examples_data_DATA = @@ -43,6 +43,8 @@ cogl_msaa_SOURCES = cogl-msaa.c cogl_msaa_LDADD = $(common_ldadd) cogl_point_sprites_SOURCES = cogl-point-sprites.c cogl_point_sprites_LDADD = $(common_ldadd) +cogl_stereo_SOURCES = cogl-stereo.c +cogl_stereo_LDADD = $(common_ldadd) if BUILD_COGL_PANGO programs += cogl-crate diff --git a/examples/cogl-stereo.c b/examples/cogl-stereo.c new file mode 100644 index 000000000..52723e13c --- /dev/null +++ b/examples/cogl-stereo.c @@ -0,0 +1,152 @@ +#include +#include +#include + +typedef struct _Data +{ + CoglContext *ctx; + CoglFramebuffer *fb; + CoglPrimitive *left_triangle; + CoglPrimitive *right_triangle; + CoglPipeline *pipeline; + + unsigned int redraw_idle; + CoglBool is_dirty; + CoglBool draw_ready; +} Data; + +static gboolean +paint_cb (void *user_data) +{ + Data *data = user_data; + + data->redraw_idle = 0; + data->is_dirty = FALSE; + data->draw_ready = FALSE; + + cogl_framebuffer_set_stereo_mode (data->fb, COGL_STEREO_BOTH); + cogl_framebuffer_clear4f (data->fb, COGL_BUFFER_BIT_COLOR, 0, 0, 0, 1); + + cogl_framebuffer_set_stereo_mode (data->fb, COGL_STEREO_LEFT); + cogl_primitive_draw (data->left_triangle, + data->fb, + data->pipeline); + + if (cogl_framebuffer_get_is_stereo (data->fb)) + { + cogl_framebuffer_set_stereo_mode (data->fb, COGL_STEREO_RIGHT); + cogl_primitive_draw (data->right_triangle, + data->fb, + data->pipeline); + } + + cogl_onscreen_swap_buffers (data->fb); + + return G_SOURCE_REMOVE; +} + +static void +maybe_redraw (Data *data) +{ + if (data->is_dirty && data->draw_ready && data->redraw_idle == 0) { + /* We'll draw on idle instead of drawing immediately so that + * if Cogl reports multiple dirty rectangles we won't + * redundantly draw multiple frames */ + data->redraw_idle = g_idle_add (paint_cb, data); + } +} + +static void +frame_event_cb (CoglOnscreen *onscreen, + CoglFrameEvent event, + CoglFrameInfo *info, + void *user_data) +{ + Data *data = user_data; + + if (event == COGL_FRAME_EVENT_SYNC) { + data->draw_ready = TRUE; + maybe_redraw (data); + } +} + +static void +dirty_cb (CoglOnscreen *onscreen, + const CoglOnscreenDirtyInfo *info, + void *user_data) +{ + Data *data = user_data; + + data->is_dirty = TRUE; + maybe_redraw (data); +} + +int +main (int argc, char **argv) +{ + Data data; + CoglRenderer *renderer; + CoglOnscreenTemplate *onscreen_template; + CoglDisplay *display; + CoglOnscreen *onscreen; + CoglError *error = NULL; + CoglVertexP2C4 left_triangle_vertices[] = { + {0.05, 0.7, 0xff, 0x00, 0x00, 0xff}, + {-0.65, -0.7, 0x00, 0xff, 0x00, 0xff}, + {0.75, -0.7, 0x00, 0x00, 0xff, 0xff} + }; + CoglVertexP2C4 right_triangle_vertices[] = { + {-0.05, 0.7, 0xff, 0x00, 0x00, 0xff}, + {-0.75, -0.7, 0x00, 0xff, 0x00, 0xff}, + {0.65, -0.7, 0x00, 0x00, 0xff, 0xff} + }; + GSource *cogl_source; + GMainLoop *loop; + + data.redraw_idle = 0; + data.is_dirty = FALSE; + data.draw_ready = TRUE; + + renderer = cogl_renderer_new (); + onscreen_template = cogl_onscreen_template_new (NULL); + cogl_onscreen_template_set_stereo_enabled (onscreen_template, TRUE); + display = cogl_display_new (renderer, onscreen_template); + + data.ctx = cogl_context_new (display, &error); + if (!data.ctx) { + fprintf (stderr, "Failed to create stereo context: %s\n", error->message); + return 1; + } + + onscreen = cogl_onscreen_new (data.ctx, 640, 480); + cogl_onscreen_show (onscreen); + data.fb = onscreen; + + cogl_onscreen_set_resizable (onscreen, TRUE); + + data.left_triangle = cogl_primitive_new_p2c4 (data.ctx, + COGL_VERTICES_MODE_TRIANGLES, + 3, left_triangle_vertices); + data.right_triangle = cogl_primitive_new_p2c4 (data.ctx, + COGL_VERTICES_MODE_TRIANGLES, + 3, right_triangle_vertices); + data.pipeline = cogl_pipeline_new (data.ctx); + + cogl_source = cogl_glib_source_new (data.ctx, G_PRIORITY_DEFAULT); + + g_source_attach (cogl_source, NULL); + + cogl_onscreen_add_frame_callback (data.fb, + frame_event_cb, + &data, + NULL); /* destroy notify */ + cogl_onscreen_add_dirty_callback (data.fb, + dirty_cb, + &data, + NULL); /* destroy notify */ + + loop = g_main_loop_new (NULL, TRUE); + g_main_loop_run (loop); + + return 0; +}