mutter/tests/conform/test-map-buffer-range.c
Neil Roberts 53f43a428f Add a test case for cogl_buffer_map_range
This adds a small test case which maps a sub region of a small
attribute buffer and replaces the texture coordinates of one of the
vertices. The vertices are then drawn and the correct colours are
checked.

There is now a new test requirement for the
COGL_FEATURE_ID_MAP_BUFFER_FOR_WRITE feature which this test requires.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit 22183265b021dd038338b4398056c0a1eae77edb)
2013-01-22 17:48:03 +00:00

123 lines
4.1 KiB
C

#include <cogl/cogl.h>
#include <string.h>
#include "test-utils.h"
static uint8_t
tex_data[2 * 2 * 4] =
{
0xff, 0x00, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff,
0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0xff, 0xff
};
/* Vertex data for a quad with all of the texture coordinates set to
* the top left (red) pixel */
static CoglVertexP2T2
vertex_data[4] =
{
{ -1, -1, 0, 0 },
{ 1, -1, 0, 0 },
{ -1, 1, 0, 0 },
{ 1, 1, 0, 0 }
};
void
test_map_buffer_range (void)
{
CoglTexture2D *tex;
CoglPipeline *pipeline;
int fb_width, fb_height;
CoglAttributeBuffer *buffer;
CoglVertexP2T2 *data;
CoglAttribute *pos_attribute;
CoglAttribute *tex_coord_attribute;
tex = cogl_texture_2d_new_from_data (ctx,
2, 2, /* width/height */
COGL_PIXEL_FORMAT_RGBA_8888_PRE,
COGL_PIXEL_FORMAT_ANY,
2 * 4, /* rowstride */
tex_data,
NULL /* error */);
pipeline = cogl_pipeline_new (ctx);
cogl_pipeline_set_layer_texture (pipeline, 0, COGL_TEXTURE (tex));
cogl_pipeline_set_layer_filters (pipeline,
0, /* layer */
COGL_PIPELINE_FILTER_NEAREST,
COGL_PIPELINE_FILTER_NEAREST);
cogl_pipeline_set_layer_wrap_mode (pipeline,
0, /* layer */
COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE);
fb_width = cogl_framebuffer_get_width (fb);
fb_height = cogl_framebuffer_get_height (fb);
buffer = cogl_attribute_buffer_new (ctx,
sizeof (vertex_data),
vertex_data);
/* Replace the texture coordinates of the third vertex with the
* coordinates for a green texel */
data = cogl_buffer_map_range (COGL_BUFFER (buffer),
sizeof (vertex_data[0]) * 2,
sizeof (vertex_data[0]),
COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD_RANGE);
g_assert (data != NULL);
data->x = vertex_data[2].x;
data->y = vertex_data[2].y;
data->s = 1.0f;
data->t = 0.0f;
cogl_buffer_unmap (COGL_BUFFER (buffer));
pos_attribute =
cogl_attribute_new (buffer,
"cogl_position_in",
sizeof (vertex_data[0]),
offsetof (CoglVertexP2T2, x),
2, /* n_components */
COGL_ATTRIBUTE_TYPE_FLOAT);
tex_coord_attribute =
cogl_attribute_new (buffer,
"cogl_tex_coord_in",
sizeof (vertex_data[0]),
offsetof (CoglVertexP2T2, s),
2, /* n_components */
COGL_ATTRIBUTE_TYPE_FLOAT);
cogl_framebuffer_clear4f (fb,
COGL_BUFFER_BIT_COLOR,
0, 0, 0, 1);
cogl_framebuffer_vdraw_attributes (fb,
pipeline,
COGL_VERTICES_MODE_TRIANGLE_STRIP,
0, /* first_vertex */
4, /* n_vertices */
pos_attribute,
tex_coord_attribute,
NULL);
/* Top left pixel should be the one that is replaced to be green */
test_utils_check_pixel (fb, 1, 1, 0x00ff00ff);
/* The other three corners should be left as red */
test_utils_check_pixel (fb, fb_width - 2, 1, 0xff0000ff);
test_utils_check_pixel (fb, 1, fb_height - 2, 0xff0000ff);
test_utils_check_pixel (fb, fb_width - 2, fb_height - 2, 0xff0000ff);
cogl_object_unref (buffer);
cogl_object_unref (pos_attribute);
cogl_object_unref (tex_coord_attribute);
cogl_object_unref (pipeline);
cogl_object_unref (tex);
if (cogl_test_verbose ())
g_print ("OK\n");
}