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authormarha <marha@users.sourceforge.net>2009-10-08 13:15:52 +0000
committermarha <marha@users.sourceforge.net>2009-10-08 13:15:52 +0000
commita0c4815433ccd57322f4f7703ca35e9ccfa59250 (patch)
treef5213802ec12adb86ec3136001c1c29fe5343700 /mesalib/progs/util/shaderutil.c
parentc73dc01b6de45612b24dc2dd34fba24d81ebf46c (diff)
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Added MesaLib-7.6
Diffstat (limited to 'mesalib/progs/util/shaderutil.c')
-rw-r--r--mesalib/progs/util/shaderutil.c315
1 files changed, 315 insertions, 0 deletions
diff --git a/mesalib/progs/util/shaderutil.c b/mesalib/progs/util/shaderutil.c
new file mode 100644
index 000000000..4db950016
--- /dev/null
+++ b/mesalib/progs/util/shaderutil.c
@@ -0,0 +1,315 @@
+/**
+ * Utilities for OpenGL shading language
+ *
+ * Brian Paul
+ * 9 April 2008
+ */
+
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <GL/glew.h>
+#include <GL/glut.h>
+#include "shaderutil.h"
+
+/** time to compile previous shader */
+static GLdouble CompileTime = 0.0;
+
+/** time to linke previous program */
+static GLdouble LinkTime = 0.0;
+
+
+GLboolean
+ShadersSupported(void)
+{
+ const char *version = (const char *) glGetString(GL_VERSION);
+ if (version[0] == '2' && version[1] == '.') {
+ return GL_TRUE;
+ }
+ else if (glutExtensionSupported("GL_ARB_vertex_shader")
+ && glutExtensionSupported("GL_ARB_fragment_shader")
+ && glutExtensionSupported("GL_ARB_shader_objects")) {
+ fprintf(stderr, "Warning: Trying ARB GLSL instead of OpenGL 2.x. This may not work.\n");
+ return GL_TRUE;
+ }
+ return GL_TRUE;
+}
+
+
+GLuint
+CompileShaderText(GLenum shaderType, const char *text)
+{
+ GLuint shader;
+ GLint stat;
+ GLdouble t0, t1;
+
+ shader = glCreateShader(shaderType);
+ glShaderSource(shader, 1, (const GLchar **) &text, NULL);
+
+ t0 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
+ glCompileShader(shader);
+ t1 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
+
+ CompileTime = t1 - t0;
+
+ glGetShaderiv(shader, GL_COMPILE_STATUS, &stat);
+ if (!stat) {
+ GLchar log[1000];
+ GLsizei len;
+ glGetShaderInfoLog(shader, 1000, &len, log);
+ fprintf(stderr, "Error: problem compiling shader: %s\n", log);
+ exit(1);
+ }
+ else {
+ /*printf("Shader compiled OK\n");*/
+ }
+ return shader;
+}
+
+
+/**
+ * Read a shader from a file.
+ */
+GLuint
+CompileShaderFile(GLenum shaderType, const char *filename)
+{
+ const int max = 100*1000;
+ int n;
+ char *buffer = (char*) malloc(max);
+ GLuint shader;
+ FILE *f;
+
+ f = fopen(filename, "r");
+ if (!f) {
+ fprintf(stderr, "Unable to open shader file %s\n", filename);
+ return 0;
+ }
+
+ n = fread(buffer, 1, max, f);
+ /*printf("read %d bytes from shader file %s\n", n, filename);*/
+ if (n > 0) {
+ buffer[n] = 0;
+ shader = CompileShaderText(shaderType, buffer);
+ }
+ else {
+ return 0;
+ }
+
+ fclose(f);
+ free(buffer);
+
+ return shader;
+}
+
+
+GLuint
+LinkShaders(GLuint vertShader, GLuint fragShader)
+{
+ GLuint program = glCreateProgram();
+ GLdouble t0, t1;
+
+ assert(vertShader || fragShader);
+
+ if (fragShader)
+ glAttachShader(program, fragShader);
+ if (vertShader)
+ glAttachShader(program, vertShader);
+
+ t0 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
+ glLinkProgram(program);
+ t1 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
+
+ LinkTime = t1 - t0;
+
+ /* check link */
+ {
+ GLint stat;
+ glGetProgramiv(program, GL_LINK_STATUS, &stat);
+ if (!stat) {
+ GLchar log[1000];
+ GLsizei len;
+ glGetProgramInfoLog(program, 1000, &len, log);
+ fprintf(stderr, "Shader link error:\n%s\n", log);
+ return 0;
+ }
+ }
+
+ return program;
+}
+
+
+GLboolean
+ValidateShaderProgram(GLuint program)
+{
+ GLint stat;
+ glValidateProgramARB(program);
+ glGetProgramiv(program, GL_VALIDATE_STATUS, &stat);
+
+ if (!stat) {
+ GLchar log[1000];
+ GLsizei len;
+ glGetProgramInfoLog(program, 1000, &len, log);
+ fprintf(stderr, "Program validation error:\n%s\n", log);
+ return 0;
+ }
+
+ return (GLboolean) stat;
+}
+
+
+GLdouble
+GetShaderCompileTime(void)
+{
+ return CompileTime;
+}
+
+
+GLdouble
+GetShaderLinkTime(void)
+{
+ return LinkTime;
+}
+
+
+void
+SetUniformValues(GLuint program, struct uniform_info uniforms[])
+{
+ GLuint i;
+
+ for (i = 0; uniforms[i].name; i++) {
+ uniforms[i].location
+ = glGetUniformLocation(program, uniforms[i].name);
+
+ switch (uniforms[i].type) {
+ case GL_INT:
+ case GL_SAMPLER_1D:
+ case GL_SAMPLER_2D:
+ case GL_SAMPLER_3D:
+ case GL_SAMPLER_CUBE:
+ case GL_SAMPLER_2D_RECT_ARB:
+ assert(uniforms[i].value[0] >= 0.0F);
+ glUniform1i(uniforms[i].location,
+ (GLint) uniforms[i].value[0]);
+ break;
+ case GL_FLOAT:
+ glUniform1fv(uniforms[i].location, 1, uniforms[i].value);
+ break;
+ case GL_FLOAT_VEC2:
+ glUniform2fv(uniforms[i].location, 1, uniforms[i].value);
+ break;
+ case GL_FLOAT_VEC3:
+ glUniform3fv(uniforms[i].location, 1, uniforms[i].value);
+ break;
+ case GL_FLOAT_VEC4:
+ glUniform4fv(uniforms[i].location, 1, uniforms[i].value);
+ break;
+ default:
+ if (strncmp(uniforms[i].name, "gl_", 3) == 0) {
+ /* built-in uniform: ignore */
+ }
+ else {
+ fprintf(stderr,
+ "Unexpected uniform data type in SetUniformValues\n");
+ abort();
+ }
+ }
+ }
+}
+
+
+/** Get list of uniforms used in the program */
+GLuint
+GetUniforms(GLuint program, struct uniform_info uniforms[])
+{
+ GLint n, max, i;
+
+ glGetProgramiv(program, GL_ACTIVE_UNIFORMS, &n);
+ glGetProgramiv(program, GL_ACTIVE_UNIFORM_MAX_LENGTH, &max);
+
+ for (i = 0; i < n; i++) {
+ GLint size, len;
+ GLenum type;
+ char name[100];
+
+ glGetActiveUniform(program, i, 100, &len, &size, &type, name);
+
+ uniforms[i].name = strdup(name);
+ uniforms[i].size = size;
+ uniforms[i].type = type;
+ uniforms[i].location = glGetUniformLocation(program, name);
+ }
+
+ uniforms[i].name = NULL; /* end of list */
+
+ return n;
+}
+
+
+void
+PrintUniforms(const struct uniform_info uniforms[])
+{
+ GLint i;
+
+ printf("Uniforms:\n");
+
+ for (i = 0; uniforms[i].name; i++) {
+ printf(" %d: %s size=%d type=0x%x loc=%d value=%g, %g, %g, %g\n",
+ i,
+ uniforms[i].name,
+ uniforms[i].size,
+ uniforms[i].type,
+ uniforms[i].location,
+ uniforms[i].value[0],
+ uniforms[i].value[1],
+ uniforms[i].value[2],
+ uniforms[i].value[3]);
+ }
+}
+
+
+/** Get list of attribs used in the program */
+GLuint
+GetAttribs(GLuint program, struct attrib_info attribs[])
+{
+ GLint n, max, i;
+
+ glGetProgramiv(program, GL_ACTIVE_ATTRIBUTES, &n);
+ glGetProgramiv(program, GL_ACTIVE_ATTRIBUTE_MAX_LENGTH, &max);
+
+ for (i = 0; i < n; i++) {
+ GLint size, len;
+ GLenum type;
+ char name[100];
+
+ glGetActiveAttrib(program, i, 100, &len, &size, &type, name);
+
+ attribs[i].name = strdup(name);
+ attribs[i].size = size;
+ attribs[i].type = type;
+ attribs[i].location = glGetAttribLocation(program, name);
+ }
+
+ attribs[i].name = NULL; /* end of list */
+
+ return n;
+}
+
+
+void
+PrintAttribs(const struct attrib_info attribs[])
+{
+ GLint i;
+
+ printf("Attribs:\n");
+
+ for (i = 0; attribs[i].name; i++) {
+ printf(" %d: %s size=%d type=0x%x loc=%d\n",
+ i,
+ attribs[i].name,
+ attribs[i].size,
+ attribs[i].type,
+ attribs[i].location);
+ }
+}