Move shader utilities to a separate file

git-svn-id: svn://cook.msm.cam.ac.uk:745/thrust3d/thrust3d@211 84d2e878-0bd5-11dd-ad15-13eda11d74c5

1 files changed, 117 insertions, 0 deletions

diff --git a/src/shaderutils.c b/src/shaderutils.c
new file mode 100644
index 0000000..74e9bff
--- /dev/null
+++ b/src/shaderutils.c
@@ -0,0 +1,117 @@
+/*
+ * shaderuitils.c
+ *
+ * Shader utilities
+ *
+ * (c) 2008 Thomas White <taw27@cam.ac.uk>
+ *
+ *  thrust3d - a silly game
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <glew.h>
+#include <stdio.h>
+
+void shaderutils_setunf(GLuint program, const char *name, GLfloat val) {
+	GLint loc;
+	loc = glGetUniformLocation(program, name);
+	glUniform1f(loc, val);
+}
+
+void shaderutils_setun2f(GLuint program, const char *name, GLfloat val1, GLfloat val2) {
+	GLint loc;
+	loc = glGetUniformLocation(program, name);
+	glUniform2f(loc, val1, val2);
+}
+
+void shaderutils_setuni(GLuint program, const char *name, GLint val) {
+	GLint loc;
+	loc = glGetUniformLocation(program, name);
+	glUniform1i(loc, val);
+}
+
+GLuint shaderutils_load_shader(const char *filename, GLenum type) {
+
+	GLuint shader;
+	char text[4096];
+	size_t len;
+	FILE *fh;
+	int l;
+	GLint status;
+	
+	fh = fopen(filename, "r");
+	if ( fh == NULL ) {
+		fprintf(stderr, "Couldn't load shader '%s'\n", filename);
+		return 0;
+	}
+	len = fread(text, 1, 4095, fh);
+	fclose(fh);
+	text[len] = '\0';
+	const GLchar *source = text;
+	shader = glCreateShader(type);
+	glShaderSource(shader, 1, &source, NULL);
+	glCompileShader(shader);
+	glGetShaderiv(shader, GL_COMPILE_STATUS, &status); 
+	if ( status == GL_FALSE ) {
+		glGetShaderInfoLog(shader, 4095, &l, text);
+		if ( l > 0 ) {
+			printf("%s\n", text); fflush(stdout);
+		} else {
+			printf("Shader compilation failed.\n");
+		}
+	}
+	
+	return shader;
+	
+}
+
+int shaderutils_link_program(GLuint program) {
+
+	int l;
+	GLint status;
+	char text[4096];
+	
+	glLinkProgram(program);
+	
+	glGetProgramiv(program, GL_LINK_STATUS, &status); 
+	if ( status == GL_FALSE ) {
+		printf("Program linking errors:\n");
+		glGetProgramInfoLog(program, 4095, &l, text);
+		if ( l > 0 ) {
+			printf("%s\n", text); fflush(stdout);
+		} else {
+			printf("Program linking failed.\n");
+		}
+	}
+	
+	return status;
+	
+}
+
+int shaderutils_validate_program(GLuint program) {
+	
+	GLint status;
+	int l;
+	char text[4096];
+	
+	glValidateProgram(program);
+	glGetProgramiv(program, GL_VALIDATE_STATUS, &status); 
+	if ( status == GL_FALSE ) {
+		printf("Program validation errors:\n");
+		glGetProgramInfoLog(program, 4095, &l, text);
+		if ( l > 0 ) {
+			printf("%s\n", text); fflush(stdout);
+		} else {
+			printf("Program did not validate successfully.\n");
+		}
+		return 0;
+	}
+	
+	return 1;
+	
+}
+