123 lines
4 KiB
C
123 lines
4 KiB
C
#include <cogl/cogl.h>
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#include <string.h>
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#include "test-utils.h"
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static uint8_t
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tex_data[2 * 2 * 4] =
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{
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0xff, 0x00, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff,
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0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0xff, 0xff
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};
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/* Vertex data for a quad with all of the texture coordinates set to
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* the top left (red) pixel */
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static CoglVertexP2T2
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vertex_data[4] =
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{
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{ -1, -1, 0, 0 },
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{ 1, -1, 0, 0 },
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{ -1, 1, 0, 0 },
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{ 1, 1, 0, 0 }
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};
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void
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test_map_buffer_range (void)
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{
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CoglTexture2D *tex;
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CoglPipeline *pipeline;
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int fb_width, fb_height;
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CoglAttributeBuffer *buffer;
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CoglVertexP2T2 *data;
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CoglAttribute *pos_attribute;
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CoglAttribute *tex_coord_attribute;
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CoglPrimitive *primitive;
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tex = cogl_texture_2d_new_from_data (test_ctx,
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2, 2, /* width/height */
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COGL_PIXEL_FORMAT_RGBA_8888_PRE,
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2 * 4, /* rowstride */
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tex_data,
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NULL /* error */);
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pipeline = cogl_pipeline_new (test_ctx);
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cogl_pipeline_set_layer_texture (pipeline, 0, tex);
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cogl_pipeline_set_layer_filters (pipeline,
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0, /* layer */
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COGL_PIPELINE_FILTER_NEAREST,
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COGL_PIPELINE_FILTER_NEAREST);
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cogl_pipeline_set_layer_wrap_mode (pipeline,
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0, /* layer */
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COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE);
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fb_width = cogl_framebuffer_get_width (test_fb);
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fb_height = cogl_framebuffer_get_height (test_fb);
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buffer = cogl_attribute_buffer_new (test_ctx,
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sizeof (vertex_data),
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vertex_data);
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/* Replace the texture coordinates of the third vertex with the
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* coordinates for a green texel */
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data = cogl_buffer_map_range (buffer,
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sizeof (vertex_data[0]) * 2,
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sizeof (vertex_data[0]),
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COGL_BUFFER_ACCESS_WRITE,
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COGL_BUFFER_MAP_HINT_DISCARD_RANGE,
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NULL); /* don't catch errors */
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g_assert (data != NULL);
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data->x = vertex_data[2].x;
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data->y = vertex_data[2].y;
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data->s = 1.0f;
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data->t = 0.0f;
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cogl_buffer_unmap (buffer);
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pos_attribute =
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cogl_attribute_new (buffer,
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"cogl_position_in",
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sizeof (vertex_data[0]),
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offsetof (CoglVertexP2T2, x),
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2, /* n_components */
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COGL_ATTRIBUTE_TYPE_FLOAT);
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tex_coord_attribute =
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cogl_attribute_new (buffer,
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"cogl_tex_coord_in",
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sizeof (vertex_data[0]),
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offsetof (CoglVertexP2T2, s),
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2, /* n_components */
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COGL_ATTRIBUTE_TYPE_FLOAT);
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cogl_framebuffer_clear4f (test_fb,
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COGL_BUFFER_BIT_COLOR,
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0, 0, 0, 1);
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primitive =
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cogl_primitive_new (COGL_VERTICES_MODE_TRIANGLE_STRIP,
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4, /* n_vertices */
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pos_attribute,
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tex_coord_attribute,
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NULL);
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cogl_primitive_draw (primitive, test_fb, pipeline);
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cogl_object_unref (primitive);
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/* Top left pixel should be the one that is replaced to be green */
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test_utils_check_pixel (test_fb, 1, 1, 0x00ff00ff);
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/* The other three corners should be left as red */
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test_utils_check_pixel (test_fb, fb_width - 2, 1, 0xff0000ff);
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test_utils_check_pixel (test_fb, 1, fb_height - 2, 0xff0000ff);
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test_utils_check_pixel (test_fb, fb_width - 2, fb_height - 2, 0xff0000ff);
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cogl_object_unref (buffer);
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cogl_object_unref (pos_attribute);
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cogl_object_unref (tex_coord_attribute);
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cogl_object_unref (pipeline);
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cogl_object_unref (tex);
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if (cogl_test_verbose ())
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g_print ("OK\n");
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}
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