mutter/tests/conform/test-color-mask.c

#include <cogl/cogl.h>

#include "test-utils.h"

#define TEX_SIZE 128

#define NUM_FBOS 3

typedef struct _TestState
{
  int width;
  int height;

  CoglTexture *tex[NUM_FBOS];
  CoglFramebuffer *fbo[NUM_FBOS];
} TestState;

static void
paint (TestState *state)
{
  CoglColor bg;
  int i;

  cogl_set_source_color4ub (255, 255, 255, 255);

  /* We push the third framebuffer first so that later we can switch
     back to it by popping to test that that works */
  cogl_push_framebuffer (state->fbo[2]);

  cogl_push_framebuffer (state->fbo[0]);
  cogl_rectangle (-1.0, -1.0, 1.0, 1.0);
  cogl_pop_framebuffer ();

  cogl_push_framebuffer (state->fbo[1]);
  cogl_rectangle (-1.0, -1.0, 1.0, 1.0);
  cogl_pop_framebuffer ();

  /* We should now be back on the third framebuffer */
  cogl_rectangle (-1.0, -1.0, 1.0, 1.0);
  cogl_pop_framebuffer ();

  cogl_color_init_from_4ub (&bg, 128, 128, 128, 255);
  cogl_clear (&bg, COGL_BUFFER_BIT_COLOR | COGL_BUFFER_BIT_DEPTH);

  /* Render all of the textures to the screen */
  for (i = 0; i < NUM_FBOS; i++)
    {
      CoglPipeline *pipeline = cogl_pipeline_new (ctx);
      cogl_pipeline_set_layer_texture (pipeline, 0, state->tex[i]);
      cogl_framebuffer_draw_rectangle (fb, pipeline,
                                       2.0f / NUM_FBOS * i - 1.0f, -1.0f,
                                       2.0f / NUM_FBOS * (i + 1) - 1.0f, 1.0f);
      cogl_object_unref (pipeline);
    }

  /* Verify all of the fbos drew the right color */
  for (i = 0; i < NUM_FBOS; i++)
    {
      guint8 expected_colors[NUM_FBOS][4] =
        { { 0xff, 0x00, 0x00, 0xff },
          { 0x00, 0xff, 0x00, 0xff },
          { 0x00, 0x00, 0xff, 0xff } };

      test_utils_check_pixel_rgb (fb,
                                  state->width * (i + 0.5f) / NUM_FBOS,
                                  state->height / 2,
                                  expected_colors[i][0],
                                  expected_colors[i][1],
                                  expected_colors[i][2]);
    }
}

void
test_color_mask (void)
{
  TestState state;
  int i;

  state.width = cogl_framebuffer_get_width (fb);
  state.height = cogl_framebuffer_get_height (fb);

  for (i = 0; i < NUM_FBOS; i++)
    {
      state.tex[i] = cogl_texture_new_with_size (128, 128,
                                                 COGL_TEXTURE_NO_ATLAS,
                                                 COGL_PIXEL_FORMAT_RGB_888);


      state.fbo[i] = COGL_FRAMEBUFFER (
        cogl_offscreen_new_to_texture (state.tex[i]));

      /* Clear the texture color bits */
      cogl_framebuffer_clear4f (state.fbo[i],
                                COGL_BUFFER_BIT_COLOR, 0, 0, 0, 1);

      cogl_framebuffer_set_color_mask (state.fbo[i],
                                       i == 0 ? COGL_COLOR_MASK_RED :
                                       i == 1 ? COGL_COLOR_MASK_GREEN :
                                       COGL_COLOR_MASK_BLUE);
    }

  /* XXX: we have to push/pop a framebuffer since this test currently
   * uses the legacy cogl_rectangle() api. */
  cogl_push_framebuffer (fb);
  paint (&state);
  cogl_pop_framebuffer ();

  if (cogl_test_verbose ())
    g_print ("OK\n");
}