tests/spec/arb_pipeline_statistics_query/pipeline_stats_clip.c

   1 /*
   2  * Copyright © 2014 Intel Corporation
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   9  * Software is furnished to do so, subject to the following conditions:
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  13  * Software.
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  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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  23
  24 /** \file pipeline_stats_clip.c
  25  *
  26  * This test verifies that the clipper related tokens of
  27  * ARB_pipeline_statistics_query() work as expected. I believe these values
  28  * are safe to use on all hardware but I am not certain.
  29  *
  30  * As with the vertex information, there seems to be a clause which allows
  31  * implementations to make non-deterministic values (13.5 quoted below).
  32  *
  33  * 13.5 (the chicken clause)
  34  *
  35  *  Implementations are allowed to pass incoming primitives unchanged and to
  36  *  output multiple primitives for an incoming primitive due to implementation
  37  *  dependent reasons as long as the results of rendering otherwise remain
  38  *  unchanged.
  39  *
  40  * 13.5.2
  41  *  When BeginQuery is called with a target of CLIPPING_INPUT_PRIMITIVES_ARB,
  42  *  the clipping input primitives count maintained by the GL is set to zero.
  43  *  When a clipping input primitives query is active, the counter is
  44  *  incremented every time a primitive reaches the primitive clipping stage
  45  *  (see section 13.5).
  46  *
  47  *  When BeginQuery is called with a target of CLIPPING_OUTPUT_PRIMITIVES_ARB,
  48  *  the clipping output primitives count maintained by the GL is set to zero.
  49  *  When a clipping output primitives query is active, the counter is
  50  *  incremented every time a primitive passes the primitive clipping stage.
  51  *  The actual number of primitives output by the primitive clipping stage for
  52  *  a particular input primitive is implementation dependent (see section 13.5)
  53  *  but must satisfy the following conditions.
  54  *
  55  * (Chicken clause 2)
  56  *  If RASTERIZER_DISCARD is enabled, implementations are allowed to
  57  *  discard primitives right after the optional transform feedback state
  58  *  (see Section 14.1). As a result, if RASTERIZER_DISCARD is enabled,
  59  *  the clipping input and output primitives count may not be
  60  *  incremented.
  61  *
  62  * To me, this makes it sound like this is impossible to test RASTERIZER_DISCARD
  63  * reliably, so I won't bother.
  64  */
  65
  66 #include "piglit-util-gl.h"
  67 #include "pipestat_help.h"
  68
  69 PIGLIT_GL_TEST_CONFIG_BEGIN
  70         config.supports_gl_compat_version = 30;
  71         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  72 PIGLIT_GL_TEST_CONFIG_END
  73
  74 static const char *vs_src =
  75         "#version 110                   \n"
  76         "                               \n"
  77         "void main()                    \n"
  78         "{                              \n"
  79         "   gl_Position = gl_Vertex;    \n"
  80         "}                              \n";
  81
  82 static struct query queries[] = {
  83         {
  84          .query = GL_CLIPPING_INPUT_PRIMITIVES_ARB,
  85          .min = NUM_PRIMS},
  86         {
  87          .query = GL_CLIPPING_OUTPUT_PRIMITIVES_ARB,
  88          .min = NUM_PRIMS}
  89 };
  90
  91 enum piglit_result
  92 piglit_display(void)
  93 {
  94         enum piglit_result ret = do_query(queries, ARRAY_SIZE(queries));
  95 #ifdef DISPLAY
  96         piglit_present_results();
  97 #endif
  98         return ret;
  99 }
 100
 101 void
 102 piglit_init(int argc, char *argv[])
 103 {
 104         GLuint vs, prog;
 105
 106         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 107
 108         piglit_require_gl_version(11);
 109         piglit_require_GLSL();
 110
 111         do_query_init(queries, ARRAY_SIZE(queries));
 112
 113         vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_src);
 114         prog = glCreateProgram();
 115         glAttachShader(prog, vs);
 116         glLinkProgram(prog);
 117
 118         if (!piglit_link_check_status(prog)) {
 119                 glDeleteProgram(prog);
 120                 piglit_report_result(PIGLIT_FAIL);
 121         }
 122
 123         glUseProgram(prog);
 124 }