1. /*
2.  * Trigger multiple sampler views for the same texture resource.
3.  
4.  */
5.  
6. #include "piglit-util-gl.h"
7.  
8. PIGLIT_GL_TEST_CONFIG_BEGIN
9. config.supports_gl_core_version = 33;
10. config.window_width = 64;
11. config.window_height = 64;
12. PIGLIT_GL_TEST_CONFIG_END
13.  
14. static GLuint tex, prog;
15. GLuint sampler_decode;
16. GLuint sampler_skip;
17.  
18. static const char *vs =
19. "#version 330\n"
20. "in vec4 piglit_vertex;"
21. "void main(){ gl_Position = piglit_vertex; }";
22.  
23. static const char *fs =
24. "#version 330\n"
25. "uniform sampler2D t0;\n"
26. "uniform sampler2D t1;\n"
27. "out vec4 c;\n"
28. "void main(){\n"
29. "    vec4 a = texture(t0, vec2(0.5));\n"
30. "    vec4 b = texture(t1, vec2(0.5));\n"
31. "    c = mix(a, b, 0.5);\n"
32. "}";
33.  
34. void piglit_init(int argc, char **argv)
35. {
36.     prog = piglit_build_simple_program(vs, fs);
37.     glUseProgram(prog);
38.  
39.     glUniform1i(glGetUniformLocation(prog, "t0"), 0);
40.     glUniform1i(glGetUniformLocation(prog, "t1"), 1);
41.  
42.     glGenSamplers(1, &sampler_decode);
43.     glSamplerParameteri(sampler_decode,
44.                         GL_TEXTURE_SRGB_DECODE_EXT,
45.                         GL_DECODE_EXT);
46.  
47.     glGenSamplers(1, &sampler_skip);
48.     glSamplerParameteri(sampler_skip,
49.                         GL_TEXTURE_SRGB_DECODE_EXT,
50.                         GL_SKIP_DECODE_EXT);
51.  
52.     /* create texture A */
53.     glGenTextures(1, &tex);
54.  
55.     glActiveTexture(GL_TEXTURE0);
56.     glBindTexture(GL_TEXTURE_2D, tex);
57.     glBindSampler(0, sampler_decode);
58.  
59.     glActiveTexture(GL_TEXTURE1);
60.     glBindTexture(GL_TEXTURE_2D, tex);
61.     glBindSampler(1, sampler_skip);
62.  
63.     uint32_t px = 0xff00ffff;
64.  
65.     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8,
66.                  1, 1, 0,
67.                  GL_RGBA, GL_UNSIGNED_BYTE,
68.                  &px);
69.  
70.     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
71.     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
72.  
73.     glBindTexture(GL_TEXTURE_2D, tex);
74. }
75.  
76. enum piglit_result piglit_display(void)
77. {
78.     glClear(GL_COLOR_BUFFER_BIT);
79.  
80.     /* draw */
81.     piglit_draw_rect(-1, -1, 2, 1);
82.  
83.     piglit_present_results();
84.     return PIGLIT_PASS;
85. }