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92c3063014
This adds cogl_framebuffer_ apis for drawing attributes and primitives that replace corresponding apis that depend on the default CoglContext. This is part of the on going effort to adapt the Cogl api so it no longer depends on a global context variable. All the new drawing functions also take an explicit pipeline argument since we are also aiming to avoid being a stateful api like Cairo and OpenGL. Being stateless makes it easier for orthogonal components to share access to the GPU. Being stateless should also minimize any impedance miss-match for those wanting to build higher level stateless apis on top of Cogl. Note: none of the legacy, global state options such as cogl_set_depth_test_enabled(), cogl_set_backface_culling_enabled() or cogl_program_use() are supported by these new drawing apis and if set will simply be silently ignored. Reviewed-by: Neil Roberts <neil@linux.intel.com>
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
#include <cogl/cogl.h>
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#include <glib.h>
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#include <stdio.h>
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CoglColor black;
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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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CoglPipeline *pipeline;
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GError *error = NULL;
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CoglVertexP2C4 triangle_vertices[] = {
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{0, 0.7, 0xff, 0x00, 0x00, 0x80},
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{-0.7, -0.7, 0x00, 0xff, 0x00, 0xff},
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{0.7, -0.7, 0x00, 0x00, 0xff, 0xff}
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};
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CoglPrimitive *triangle;
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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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cogl_onscreen_show (onscreen);
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fb = COGL_FRAMEBUFFER (onscreen);
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triangle = cogl_primitive_new_p2c4 (COGL_VERTICES_MODE_TRIANGLES,
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3, triangle_vertices);
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pipeline = cogl_pipeline_new ();
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for (;;) {
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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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cogl_framebuffer_clear4f (fb, COGL_BUFFER_BIT_COLOR, 0, 0, 0, 1);
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cogl_framebuffer_draw_primitive (fb, pipeline, triangle);
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cogl_framebuffer_swap_buffers (fb);
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cogl_poll_get_info (ctx, &poll_fds, &n_poll_fds, &timeout);
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g_poll ((GPollFD *) poll_fds, n_poll_fds, 0);
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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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