tests/spec/arb_separate_shader_objects/sso-common.c

   1 /*
   2  * Copyright © 2013 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file sso-common.c
  26  * Utility functions used by multiple separate shader objects tests.
  27  */
  28 #include "piglit-util-gl.h"
  29 #include "sso-common.h"
  30
  31 /**
  32  * Pick a GLSL version that will work with explicit location layout qualifiers
  33  *
  34  * Some NVIDIA drivers have issues with layout qualifiers, 'in' keywords, and
  35  * 'out' keywords in "lower" GLSL versions.  If the driver supports GLSL >=
  36  * 1.40, use 1.40.  Otherwise, pick the highest version that the driver
  37  * supports.
  38  *
  39  * 1.40 is selected as the maximum version because core-profile contexts
  40  * aren't required to support versions earlier than 1.40.  Otherwise, 1.30
  41  * would also work.
  42  */
  43 unsigned
  44 pick_a_glsl_version(void)
  45 {
  46         unsigned glsl_version;
  47         bool es;
  48         int glsl_major;
  49         int glsl_minor;
  50
  51         piglit_get_glsl_version(&es, &glsl_major, &glsl_minor);
  52         glsl_version = ((glsl_major * 100) + glsl_minor) >= 140
  53                 ? 140 : ((glsl_major * 100) + glsl_minor);
  54
  55         return glsl_version;
  56 }
  57
  58 GLuint
  59 format_and_link_program(GLenum type, const char* code, unsigned glsl_version)
  60 {
  61         char *source;
  62         GLuint prog;
  63
  64         (void)!asprintf(&source, code, glsl_version);
  65         prog = glCreateShaderProgramv(type, 1,
  66                         (const GLchar *const *) &source);
  67
  68         piglit_link_check_status(prog);
  69         free(source);
  70
  71         return prog;
  72 }
  73
  74 /**
  75  * Create a transform feedback object and some storage for the data
  76  *
  77  * \note
  78  * The XFB object will be bound on exit.  The buffer object for the XFB data
  79  * will be bound to the XFB object and the \c GL_TRANSFORM_FEEDBACK_BUFFER
  80  * binding on exit.
  81  */
  82 void
  83 configure_transform_feedback_object(GLuint *xfb, GLuint *buf)
  84 {
  85         glGenBuffers(1, buf);
  86         glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, *buf);
  87         glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER, 1024, NULL, GL_STREAM_READ);
  88
  89         glGenTransformFeedbacks(1, xfb);
  90
  91         glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, *xfb);
  92         glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, *buf);
  93 }
  94
  95 /**
  96  * Create a separable vertex shader program with transform feedback output
  97  *
  98  * A vertex shader must be created using the "traditional" API because
  99  * \c glTransformFeedbackVaryings must be called before linking.  There is no
 100  * way to do that with \c glCreateShaderProgramv.
 101  */
 102 bool
 103 CreateShaderProgram_with_xfb(const char *source,
 104                              const char **varyings,
 105                              unsigned num_varyings,
 106                              GLuint *vs_prog)
 107 {
 108         GLuint vs = piglit_compile_shader_text(GL_VERTEX_SHADER, source);
 109
 110         *vs_prog = glCreateProgram();
 111         glAttachShader(*vs_prog, vs);
 112
 113         glProgramParameteri(*vs_prog, GL_PROGRAM_SEPARABLE, GL_TRUE);
 114         glTransformFeedbackVaryings(*vs_prog, num_varyings, varyings,
 115                                     GL_INTERLEAVED_ATTRIBS);
 116         glLinkProgram(*vs_prog);
 117         glDeleteShader(vs);
 118
 119         return piglit_link_check_status(*vs_prog);
 120 }