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authorBrian Paul <brianp@vmware.com>2009-09-21 11:58:03 -0600
committerBrian Paul <brianp@vmware.com>2009-09-21 11:58:03 -0600
commit05bce0898087b135cb18bc4f2f2896da034928dc (patch)
tree31c6f97d85740957256a0e2f4460ac49fa39c677 /progs
parent83fbee6e0be46efab4b60ba50fceb103f8937ac1 (diff)
progs/perf: added helpers for creating simple textures and shader programs
Diffstat (limited to 'progs')
-rw-r--r--progs/perf/glmain.c103
-rw-r--r--progs/perf/glmain.h6
2 files changed, 109 insertions, 0 deletions
diff --git a/progs/perf/glmain.c b/progs/perf/glmain.c
index 62d14259f8..83c7b8a79c 100644
--- a/progs/perf/glmain.c
+++ b/progs/perf/glmain.c
@@ -26,6 +26,7 @@
*/
+#include <stdio.h>
#include "glmain.h"
#include <GL/glut.h>
@@ -50,6 +51,108 @@ PerfSwapBuffers(void)
}
+/** make simple checkerboard texture object */
+GLuint
+PerfCheckerTexture(GLsizei width, GLsizei height)
+{
+ const GLenum filter = GL_NEAREST;
+ GLubyte *img = (GLubyte *) malloc(width * height * 4);
+ GLint i, j, k;
+ GLuint obj;
+
+ k = 0;
+ for (i = 0; i < height; i++) {
+ for (j = 0; j < width; j++) {
+ GLubyte color;
+ if (((i / 8) ^ (j / 8)) & 1) {
+ color = 0xff;
+ }
+ else {
+ color = 0x0;
+ }
+ img[k++] = color;
+ img[k++] = color;
+ img[k++] = color;
+ img[k++] = color;
+ }
+ }
+
+ glGenTextures(1, &obj);
+ glBindTexture(GL_TEXTURE_2D, obj);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
+ GL_RGBA, GL_UNSIGNED_BYTE, img);
+ free(img);
+
+ return obj;
+}
+
+
+static GLuint
+CompileShader(GLenum type, const char *shader)
+{
+ GLuint sh;
+ GLint stat;
+
+ sh = glCreateShader(type);
+ glShaderSource(sh, 1, (const GLchar **) &shader, NULL);
+
+ glCompileShader(sh);
+
+ glGetShaderiv(sh, GL_COMPILE_STATUS, &stat);
+ if (!stat) {
+ GLchar log[1000];
+ GLsizei len;
+ glGetShaderInfoLog(sh, 1000, &len, log);
+ fprintf(stderr, "Error: problem compiling shader: %s\n", log);
+ exit(1);
+ }
+
+ return sh;
+}
+
+
+/** Make shader program from given vert/frag shader text */
+GLuint
+PerfShaderProgram(const char *vertShader, const char *fragShader)
+{
+ GLuint prog;
+ GLint stat;
+
+ {
+ const char *version = (const char *) glGetString(GL_VERSION);
+ if (version[0] != '2' || version[1] != '.') {
+ fprintf(stderr, "Error: GL version 2.x required\n");
+ exit(1);
+ }
+ }
+
+ prog = glCreateProgram();
+
+ if (vertShader) {
+ GLuint vs = CompileShader(GL_VERTEX_SHADER, vertShader);
+ glAttachShader(prog, vs);
+ }
+ if (fragShader) {
+ GLuint fs = CompileShader(GL_FRAGMENT_SHADER, fragShader);
+ glAttachShader(prog, fs);
+ }
+
+ glLinkProgram(prog);
+ glGetProgramiv(prog, GL_LINK_STATUS, &stat);
+ if (!stat) {
+ GLchar log[1000];
+ GLsizei len;
+ glGetProgramInfoLog(prog, 1000, &len, log);
+ fprintf(stderr, "Shader link error:\n%s\n", log);
+ exit(1);
+ }
+
+ return prog;
+}
+
+
static void
Idle(void)
{
diff --git a/progs/perf/glmain.h b/progs/perf/glmain.h
index fe11d7235e..91f2eb3e74 100644
--- a/progs/perf/glmain.h
+++ b/progs/perf/glmain.h
@@ -40,6 +40,12 @@ PerfGetTime(void);
extern void
PerfSwapBuffers(void);
+extern GLuint
+PerfCheckerTexture(GLsizei width, GLsizei height);
+
+extern GLuint
+PerfShaderProgram(const char *vertShader, const char *fragShader);
+
/** Test programs must implement these functions **/