tests/shaders/unsuccessful-relink.c

   1 /*
   2  * Copyright © 2017 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 unsuccessful-relink.c
  26  *
  27  * Render using a program with a uniform. Modify the uniform and then
  28  * do a relink that will fail. This shouldn’t affect the original
  29  * program and it should render with the new uniform value.
  30  *
  31  * GLSL 4.6 spec section 7.3:
  32  *
  33  * “If a program object that is active for any shader stage is
  34  *  re-linked unsuccessfully, the link status will be set to FALSE,
  35  *  but any existing executables and associated state will remain part
  36  *  of the current rendering state until a subsequent call to
  37  *  UseProgram, UseProgramStages, or BindProgramPipeline removes them
  38  *  from use.”
  39  */
  40
  41 #include "piglit-util-gl.h"
  42
  43 PIGLIT_GL_TEST_CONFIG_BEGIN
  44
  45         config.supports_gl_compat_version = 20;
  46         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  47
  48 PIGLIT_GL_TEST_CONFIG_END
  49
  50 static const char vs_source[] =
  51         "attribute vec4 piglit_vertex;\n"
  52         "void main()\n"
  53         "{\n"
  54         "       gl_Position = piglit_vertex;\n"
  55         "}\n";
  56
  57 static const char fs_source[] =
  58         "uniform vec4 color;\n"
  59         "void main()\n"
  60         "{\n"
  61         "       gl_FragColor = color;\n"
  62         "}\n";
  63
  64 static const float green[] = { 0.0f, 1.0f, 0.0f, 1.0f };
  65 static const float purple[] = { 0.5f, 0.0f, 0.5f, 1.0f };
  66
  67 static bool
  68 try_render(GLuint vertex_attrib,
  69            const float *color)
  70 {
  71         struct vertex { float x, y; };
  72         static const struct vertex verts[] = {
  73                 { -1, -1 }, { 1, -1 },
  74                 { -1, 1 }, { 1, 1 }
  75         };
  76         bool pass;
  77         GLuint buf;
  78
  79         /* This isn’t using piglit_draw_rect because that tries to
  80          * call glGetAttribLocation which won’t work on the unlinked
  81          * program
  82          */
  83
  84         glGenBuffers(1, &buf);
  85         glBindBuffer(GL_ARRAY_BUFFER, buf);
  86         glBufferData(GL_ARRAY_BUFFER, sizeof verts, verts, GL_STATIC_DRAW);
  87         glVertexAttribPointer(vertex_attrib, 2, GL_FLOAT,
  88                               GL_FALSE, sizeof verts[0],
  89                               (void *) offsetof(struct vertex, x));
  90         glEnableVertexAttribArray(vertex_attrib);
  91         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
  92         glBindBuffer(GL_ARRAY_BUFFER, 0);
  93         glDeleteBuffers(1, &buf);
  94
  95         if (!piglit_check_gl_error(GL_NO_ERROR)) {
  96                 fprintf(stderr, "error while drawing\n");
  97                 piglit_report_result(PIGLIT_FAIL);
  98         }
  99
 100         pass = piglit_probe_rect_rgb(0, 0,
 101                                      piglit_width, piglit_height,
 102                                      color);
 103         if (!pass)
 104                 fprintf(stderr, "render failed\n");
 105
 106         return pass;
 107 }
 108
 109 static void
 110 unsuccessful_link(GLuint prog)
 111 {
 112         GLuint shader;
 113         GLint status;
 114         int i;
 115
 116         /* Add the fs shader again. This should cause a link error
 117          * because there would be two main functions in the fragment
 118          * stage. */
 119         for (i = 0; i < 2; i++) {
 120                 shader = piglit_compile_shader_text(GL_FRAGMENT_SHADER,
 121                                                     fs_source);
 122                 glAttachShader(prog, shader);
 123         }
 124
 125         glLinkProgram(prog);
 126
 127         glGetProgramiv(prog, GL_LINK_STATUS, &status);
 128
 129         if (status) {
 130                 fprintf(stderr, "Broken shader unexpectedly linked\n");
 131                 piglit_report_result(PIGLIT_FAIL);
 132         }
 133 }
 134
 135 enum piglit_result
 136 piglit_display(void)
 137 {
 138         bool pass = true;
 139         GLuint prog;
 140         GLint color_uniform;
 141         GLint vertex_attrib;
 142         void *dummy_data[2048];
 143         int i;
 144
 145         glViewport(0, 0, piglit_width, piglit_height);
 146         glClear(GL_COLOR_BUFFER_BIT);
 147
 148         prog = piglit_build_simple_program(vs_source, fs_source);
 149
 150         color_uniform = glGetUniformLocation(prog, "color");
 151
 152         if (color_uniform == -1) {
 153                 fprintf(stderr, "color uniform missing\n");
 154                 piglit_report_result(PIGLIT_FAIL);
 155         }
 156
 157         vertex_attrib = glGetAttribLocation(prog, "piglit_vertex");
 158
 159         if (vertex_attrib == -1) {
 160                 fprintf(stderr, "piglit_vertex attrib missing\n");
 161                 piglit_report_result(PIGLIT_FAIL);
 162         }
 163
 164         glUseProgram(prog);
 165
 166         glUniform4fv(color_uniform, 1, purple);
 167
 168         if (!try_render(vertex_attrib, purple))
 169                 pass = false;
 170
 171         glUniform4fv(color_uniform, 1, green);
 172
 173         unsuccessful_link(prog);
 174
 175         /* This test currently causes a use-after-free error in Mesa
 176          * which causes sporadic failures. In order to increase the
 177          * chances of making the test fail, we will do lots of little
 178          * redundant allocations in the hope of overwriting the data
 179          * previously allocated and freed by Mesa.
 180          */
 181         for (i = 0; i < ARRAY_SIZE(dummy_data); i++) {
 182                 dummy_data[i] = malloc(64);
 183                 memset(dummy_data[i], 0, 64);
 184         }
 185         for (i = 0; i < ARRAY_SIZE(dummy_data); i++)
 186                 free(dummy_data[i]);
 187
 188         if (!try_render(vertex_attrib, green))
 189                 pass = false;
 190
 191         piglit_present_results();
 192
 193         glDeleteProgram(prog);
 194
 195         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 196 }
 197
 198 void
 199 piglit_init(int argc, char **argv)
 200 {
 201 }