Attachment 67548 Details for Bug 55224 – Test case to reproduce register interference

Test case to reproduce register interference

NVC0RAClobberTest.cpp (text/plain), 3.79 KB, created by Jay Cornwall on 2012-09-22 16:32:11 UTC

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Creator: Jay Cornwall

Created: 2012-09-22 16:32:11 UTC

Size: 3.79 KB

patch

obsolete

>#include <GL/glew.h>
>#include <GL/glx.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <X11/Xlib.h>
>
>#define mChkGL(X) X; CheckGLError(__LINE__);
>
>const GLchar *VertexCode =
>  "#version 130               \n"
>  "                           \n"
>  "void main() {              \n"
>  "  gl_Position = gl_Vertex; \n"
>  "}                          \n"
>;
>
>const GLchar *FragmentCode =
>  "#version 130                                       \n"
>  "                                                   \n"
>  "void main() {                                      \n"
>  "  float a = gl_FragCoord.x;                        \n"
>  "  int   b = int(a);                                \n"
>  "  int   d = b % 2;                                 \n"
>  "  gl_FragColor.x = 1.0;                            \n"
>  "  gl_FragColor.y = 0.0;                            \n"
>  "  gl_FragColor.z = a * d;                          \n"
>  "  gl_FragColor.w = 0.0;                            \n"
>  "}                                                  \n"
>;
>
>void CheckGLError(int line) {
>  GLint glErr = glGetError();
>
>  if(glErr != GL_NO_ERROR) {
>    printf("OpenGL error %d at line %d\n", glErr, line);
>    exit(1);
>  }
>}
>
>int main() {
>  // Minimal setup.
>  int visual[] = { GLX_RGBA, 0 };
>
>  Display *display = XOpenDisplay(NULL);
>  Window window = XCreateSimpleWindow(display, DefaultRootWindow(display), 0, 0, 1, 1, 0, 0, 0);
>  XVisualInfo *vInfo = glXChooseVisual(display, DefaultScreen(display), visual);
>  GLXContext glCtx = glXCreateContext(display, vInfo, NULL, 1);
>  glXMakeCurrent(display, window, glCtx);
>  glewInit();
>
>  // Build shader program.
>  GLuint vShader = glCreateShader(GL_VERTEX_SHADER);
>  GLuint fShader = glCreateShader(GL_FRAGMENT_SHADER);
>
>  mChkGL(glShaderSource(vShader, 1, &VertexCode,   NULL));
>  mChkGL(glShaderSource(fShader, 1, &FragmentCode, NULL));
>  mChkGL(glCompileShader(vShader));
>  mChkGL(glCompileShader(fShader));
>
>  GLint compileLogSize;
>  mChkGL(glGetShaderiv(vShader, GL_INFO_LOG_LENGTH, &compileLogSize));
>  mChkGL(glGetShaderiv(fShader, GL_INFO_LOG_LENGTH, &compileLogSize));
>
>  GLuint program = glCreateProgram();
>  mChkGL(glAttachShader(program, vShader));
>  mChkGL(glAttachShader(program, fShader));
>  mChkGL(glLinkProgram(program));
>
>  // Bind renderbuffer to capture shader output.
>  GLuint renderBuf;
>  mChkGL(glGenRenderbuffers(1, &renderBuf));
>  mChkGL(glBindRenderbuffer(GL_RENDERBUFFER, renderBuf));
>  mChkGL(glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA32F, 100, 100));
>
>  GLuint frameBuf;
>  mChkGL(glGenFramebuffers(1, &frameBuf));
>  mChkGL(glBindFramebuffer(GL_FRAMEBUFFER, frameBuf));
>  mChkGL(glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, renderBuf));
>  mChkGL(glDrawBuffer(GL_COLOR_ATTACHMENT0));
>
>  // Render shader across viewport and copy back color output.
>  float vertices[] = { -1.0f, -1.0f, -1.0f,  1.0f, 1.0f, -1.0f, 1.0f,  1.0f };
>  mChkGL(glEnableClientState(GL_VERTEX_ARRAY));
>  mChkGL(glVertexPointer(2, GL_FLOAT, 0, vertices));
>
>  mChkGL(glUseProgram(program));
>  mChkGL(glViewport(0, 0, 100, 100));
>  mChkGL(glDrawArrays(GL_TRIANGLE_STRIP, 0, 4));
>
>  float *pixels = new float[100 * 100 * 4];
>  mChkGL(glReadBuffer(GL_COLOR_ATTACHMENT0));
>  mChkGL(glReadPixels(0, 0, 100, 100, GL_RGBA, GL_FLOAT, pixels));
>
>  // Validate shaded output.
>  for(int y = 0; y < 100; ++ y) {
>    for(int x = 0; x < 100; ++ x) {
>      float *pixel = &pixels[y * 100 * 4 + x * 4];
>      float expectB = (float(x) + 0.5f) * float(x % 2);
>
>      if(pixel[0] != 1.0f    ||
>         pixel[1] != 0.0f    ||
>         pixel[2] != expectB ||
>         pixel[3] != 0.0f)
>      {
>        printf("Validation FAILED\n");
>        printf("  At %dx%d, expected [1.0,0.0,%.1f,0.0] got [%f,%f,%f,%f]\n",
>          x, y, expectB, pixel[0], pixel[1], pixel[2], pixel[3]);
>        return 1;
>      }
>    }
>  }
>
>  printf("Validation PASSED\n");
>}

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Attachments on bug 55224: 67548 | 67549

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