Add a tri glsl sample.

[apitrace-tests] / apps / gl / tri_glsl.c

diff --git a/apps/gl/tri_glsl.c b/apps/gl/tri_glsl.c
new file mode 100644 (file)
index 0000000..741aece
--- /dev/null
+++ b/apps/gl/tri_glsl.c
@@ -0,0 +1,154 @@
+/* Test fragment shader
+ *
+ * Brian Pau
+ */
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+#include <GL/glew.h>
+#ifdef __APPLE__
+#  include <GLUT/glut.h>
+#else
+#  include <GL/glut.h>
+#endif
+
+
+static GLuint fragShader;
+static GLuint vertShader;
+static GLuint program;
+static GLint win = 0;
+static GLfloat xpos = 0, ypos = 0;
+
+
+static void
+LoadAndCompileShader(GLuint shader, const char *text)
+{
+   const GLint length = -1;
+   GLint stat;
+
+   glShaderSource(shader, 1, (const GLchar **) &text, &length);
+
+   glCompileShader(shader);
+
+   glGetShaderiv(shader, GL_COMPILE_STATUS, &stat);
+   if (!stat) {
+      GLchar log[1000];
+      GLsizei len;
+      glGetShaderInfoLog(shader, 1000, &len, log);
+      fprintf(stderr, "fslight: problem compiling shader:\n%s\n", log);
+      exit(1);
+   }
+}
+
+
+static void
+CheckLink(GLuint prog)
+{
+   GLint stat;
+   glGetProgramiv(prog, GL_LINK_STATUS, &stat);
+   if (!stat) {
+      GLchar log[1000];
+      GLsizei len;
+      glGetProgramInfoLog(prog, 1000, &len, log);
+      fprintf(stderr, "Linker error:\n%s\n", log);
+   }
+}
+
+
+static void
+Init(void)
+{
+   static const char *fragShaderText =
+      "void main() {\n"
+      "   gl_FragColor = gl_Color; \n"
+      "}\n";
+   static const char *vertShaderText =
+      "void main() {\n"
+      "   gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
+      "   gl_FrontColor = gl_Color;\n"
+      "}\n";
+
+   if (!GLEW_VERSION_2_0) {
+      printf("This program requires OpenGL 2.x\n");
+      exit(1);
+   }
+
+   fragShader = glCreateShader(GL_FRAGMENT_SHADER);
+   LoadAndCompileShader(fragShader, fragShaderText);
+
+   vertShader = glCreateShader(GL_VERTEX_SHADER);
+   LoadAndCompileShader(vertShader, vertShaderText);
+
+   program = glCreateProgram();
+   glAttachShader(program, fragShader);
+   glAttachShader(program, vertShader);
+   glLinkProgram(program);
+   CheckLink(program);
+   glUseProgram(program);
+
+   assert(glGetError() == 0);
+
+   glClearColor(0.3f, 0.1f, 0.3f, 1.0f);
+}
+
+
+static void
+Reshape(int width, int height)
+{
+   glViewport(0, 0, width, height);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
+   glMatrixMode(GL_MODELVIEW);
+}
+
+
+static void
+Draw(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT);
+
+   glBegin(GL_TRIANGLES);
+   glColor3f(.8, 0, 0); 
+   glVertex3f(-0.9, -0.9, -30.0);
+   glColor3f(0, .9, 0); 
+   glVertex3f( 0.9, -0.9, -30.0);
+   glColor3f(0, 0, .7); 
+   glVertex3f( 0.0,  0.9, -30.0);
+   glEnd();
+
+   glFlush();
+
+   glutSwapBuffers();
+
+   glDeleteShader(fragShader);
+   glDeleteShader(vertShader);
+   glDeleteProgram(program);
+   glutDestroyWindow(win);
+
+   exit(0);
+}
+
+
+int
+main(int argc, char **argv)
+{
+   glutInit(&argc, argv);
+   glutInitWindowSize(250, 250);
+   glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
+   win = glutCreateWindow(argv[0]);
+   glewInit();
+   glutReshapeFunc(Reshape);
+   glutDisplayFunc(Draw);
+   Init();
+   glutMainLoop();
+   return 0;
+}