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-rw-r--r--progs/glsl/shtest.c562
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diff --git a/progs/glsl/shtest.c b/progs/glsl/shtest.c
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+/*
+ * Simple shader test harness.
+ * Brian Paul
+ * 13 Aug 2009
+ *
+ * Usage:
+ * shtest --vs vertShaderFile --fs fragShaderFile
+ *
+ * In this case the given vertex/frag shaders are read and compiled.
+ * Random values are assigned to the uniforms.
+ *
+ * or:
+ * shtest configFile
+ *
+ * In this case a config file is read that specifies the file names
+ * of the shaders plus initial values for uniforms.
+ *
+ * Example config file:
+ *
+ * vs shader.vert
+ * fs shader.frag
+ * uniform pi 3.14159
+ * uniform v1 1.0 0.5 0.2 0.3
+ *
+ */
+
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <GL/glew.h>
+#include <GL/glu.h>
+#include <GL/glut.h>
+#include "shaderutil.h"
+
+
+typedef enum
+{
+ SPHERE,
+ CUBE,
+ NUM_SHAPES
+} shape;
+
+
+static char *FragShaderFile = NULL;
+static char *VertShaderFile = NULL;
+static char *ConfigFile = NULL;
+
+/* program/shader objects */
+static GLuint fragShader;
+static GLuint vertShader;
+static GLuint Program;
+
+
+#define MAX_UNIFORMS 100
+static struct uniform_info Uniforms[MAX_UNIFORMS];
+static GLuint NumUniforms = 0;
+
+
+#define MAX_ATTRIBS 100
+static struct attrib_info Attribs[MAX_ATTRIBS];
+static GLuint NumAttribs = 0;
+
+
+/**
+ * Config file info.
+ */
+struct config_file
+{
+ struct name_value
+ {
+ char name[100];
+ float value[4];
+ int type;
+ } uniforms[100];
+
+ int num_uniforms;
+};
+
+
+static GLint win = 0;
+static GLboolean Anim = GL_FALSE;
+static GLfloat TexRot = 0.0;
+static GLfloat xRot = 0.0f, yRot = 0.0f, zRot = 0.0f;
+static shape Object = SPHERE;
+
+
+static float
+RandomFloat(float min, float max)
+{
+ int k = rand() % 10000;
+ float x = min + (max - min) * k / 10000.0;
+ return x;
+}
+
+
+/** Set new random values for uniforms */
+static void
+RandomUniformValues(void)
+{
+ GLuint i;
+ for (i = 0; i < NumUniforms; i++) {
+ if (Uniforms[i].type == GL_FLOAT) {
+ Uniforms[i].value[0] = RandomFloat(0.0, 1.0);
+ }
+ else {
+ Uniforms[i].value[0] = RandomFloat(-1.0, 2.0);
+ Uniforms[i].value[1] = RandomFloat(-1.0, 2.0);
+ Uniforms[i].value[2] = RandomFloat(-1.0, 2.0);
+ Uniforms[i].value[3] = RandomFloat(-1.0, 2.0);
+ }
+ }
+}
+
+
+static void
+Idle(void)
+{
+ yRot += 2.0;
+ if (yRot > 360.0)
+ yRot -= 360.0;
+ glutPostRedisplay();
+}
+
+
+
+static void
+SquareVertex(GLfloat s, GLfloat t, GLfloat size)
+{
+ GLfloat x = -size + s * 2.0 * size;
+ GLfloat y = -size + t * 2.0 * size;
+ glTexCoord2f(s, t);
+ glVertex2f(x, y);
+}
+
+
+/*
+ * Draw a square, specifying normal and tangent vectors.
+ */
+static void
+Square(GLfloat size)
+{
+ GLint tangentAttrib = 1;
+ glNormal3f(0, 0, 1);
+ glVertexAttrib3f(tangentAttrib, 1, 0, 0);
+ glBegin(GL_POLYGON);
+#if 0
+ SquareVertex(0, 0, size);
+ SquareVertex(1, 0, size);
+ SquareVertex(1, 1, size);
+ SquareVertex(0, 1, size);
+#else
+ glTexCoord2f(0, 0); glVertex2f(-size, -size);
+ glTexCoord2f(1, 0); glVertex2f( size, -size);
+ glTexCoord2f(1, 1); glVertex2f( size, size);
+ glTexCoord2f(0, 1); glVertex2f(-size, size);
+#endif
+ glEnd();
+}
+
+
+static void
+Cube(GLfloat size)
+{
+ /* +X */
+ glPushMatrix();
+ glRotatef(90, 0, 1, 0);
+ glTranslatef(0, 0, size);
+ Square(size);
+ glPopMatrix();
+
+ /* -X */
+ glPushMatrix();
+ glRotatef(-90, 0, 1, 0);
+ glTranslatef(0, 0, size);
+ Square(size);
+ glPopMatrix();
+
+ /* +Y */
+ glPushMatrix();
+ glRotatef(90, 1, 0, 0);
+ glTranslatef(0, 0, size);
+ Square(size);
+ glPopMatrix();
+
+ /* -Y */
+ glPushMatrix();
+ glRotatef(-90, 1, 0, 0);
+ glTranslatef(0, 0, size);
+ Square(size);
+ glPopMatrix();
+
+
+ /* +Z */
+ glPushMatrix();
+ glTranslatef(0, 0, size);
+ Square(size);
+ glPopMatrix();
+
+ /* -Z */
+ glPushMatrix();
+ glRotatef(180, 0, 1, 0);
+ glTranslatef(0, 0, size);
+ Square(size);
+ glPopMatrix();
+}
+
+
+static void
+Sphere(GLfloat radius, GLint slices, GLint stacks)
+{
+ static GLUquadricObj *q = NULL;
+
+ if (!q) {
+ q = gluNewQuadric();
+ gluQuadricDrawStyle(q, GLU_FILL);
+ gluQuadricNormals(q, GLU_SMOOTH);
+ gluQuadricTexture(q, GL_TRUE);
+ }
+
+ gluSphere(q, radius, slices, stacks);
+}
+
+
+static void
+Redisplay(void)
+{
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+ glPushMatrix();
+ glRotatef(xRot, 1.0f, 0.0f, 0.0f);
+ glRotatef(yRot, 0.0f, 1.0f, 0.0f);
+ glRotatef(zRot, 0.0f, 0.0f, 1.0f);
+
+ glMatrixMode(GL_TEXTURE);
+ glLoadIdentity();
+ glRotatef(TexRot, 0.0f, 1.0f, 0.0f);
+ glMatrixMode(GL_MODELVIEW);
+
+ if (Object == SPHERE) {
+ Sphere(2.0, 20, 10);
+ }
+ else if (Object == CUBE) {
+ Cube(2.0);
+ }
+
+ glPopMatrix();
+
+ glutSwapBuffers();
+}
+
+
+static void
+Reshape(int width, int height)
+{
+ glViewport(0, 0, width, height);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+ glTranslatef(0.0f, 0.0f, -15.0f);
+}
+
+
+static void
+CleanUp(void)
+{
+ glDeleteShader(fragShader);
+ glDeleteShader(vertShader);
+ glDeleteProgram(Program);
+ glutDestroyWindow(win);
+}
+
+
+static void
+Key(unsigned char key, int x, int y)
+{
+ const GLfloat step = 2.0;
+ (void) x;
+ (void) y;
+
+ switch(key) {
+ case 'a':
+ Anim = !Anim;
+ if (Anim)
+ glutIdleFunc(Idle);
+ else
+ glutIdleFunc(NULL);
+ break;
+ case 'z':
+ zRot += step;
+ break;
+ case 'Z':
+ zRot -= step;
+ break;
+ case 'o':
+ Object = (Object + 1) % NUM_SHAPES;
+ break;
+ case 'r':
+ RandomUniformValues();
+ SetUniformValues(Program, Uniforms);
+ PrintUniforms(Uniforms);
+ break;
+ case 27:
+ CleanUp();
+ exit(0);
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+static void
+SpecialKey(int key, int x, int y)
+{
+ const GLfloat step = 2.0;
+
+ (void) x;
+ (void) y;
+
+ switch(key) {
+ case GLUT_KEY_UP:
+ xRot += step;
+ break;
+ case GLUT_KEY_DOWN:
+ xRot -= step;
+ break;
+ case GLUT_KEY_LEFT:
+ yRot -= step;
+ break;
+ case GLUT_KEY_RIGHT:
+ yRot += step;
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+static void
+InitUniforms(const struct config_file *conf,
+ struct uniform_info uniforms[])
+{
+ int i;
+
+ for (i = 0; i < conf->num_uniforms; i++) {
+ int j;
+ for (j = 0; uniforms[j].name; j++) {
+ if (strcmp(uniforms[j].name, conf->uniforms[i].name) == 0) {
+ uniforms[j].type = conf->uniforms[i].type;
+ uniforms[j].value[0] = conf->uniforms[i].value[0];
+ uniforms[j].value[1] = conf->uniforms[i].value[1];
+ uniforms[j].value[2] = conf->uniforms[i].value[2];
+ uniforms[j].value[3] = conf->uniforms[i].value[3];
+ }
+ }
+ }
+}
+
+
+/**
+ * Read a config file.
+ */
+static void
+ReadConfigFile(const char *filename, struct config_file *conf)
+{
+ char line[1000];
+ FILE *f;
+
+ f = fopen(filename, "r");
+ if (!f) {
+ fprintf(stderr, "Unable to open config file %s\n", filename);
+ exit(1);
+ }
+
+ conf->num_uniforms = 0;
+
+ /* ugly but functional parser */
+ while (!feof(f)) {
+ fgets(line, sizeof(line), f);
+ if (line[0]) {
+ if (strncmp(line, "vs ", 3) == 0) {
+ VertShaderFile = strdup(line + 3);
+ VertShaderFile[strlen(VertShaderFile) - 1] = 0;
+ }
+ else if (strncmp(line, "fs ", 3) == 0) {
+ FragShaderFile = strdup(line + 3);
+ FragShaderFile[strlen(FragShaderFile) - 1] = 0;
+ }
+ else if (strncmp(line, "uniform ", 8) == 0) {
+ char name[1000];
+ int k;
+ float v1, v2, v3, v4;
+ GLenum type;
+
+ k = sscanf(line + 8, "%s %f %f %f %f", name, &v1, &v2, &v3, &v4);
+
+ switch (k) {
+ case 1:
+ type = GL_NONE;
+ abort();
+ break;
+ case 2:
+ type = GL_FLOAT;
+ break;
+ case 3:
+ type = GL_FLOAT_VEC2;
+ break;
+ case 4:
+ type = GL_FLOAT_VEC3;
+ break;
+ case 5:
+ type = GL_FLOAT_VEC4;
+ break;
+ }
+
+ strcpy(conf->uniforms[conf->num_uniforms].name, name);
+ conf->uniforms[conf->num_uniforms].value[0] = v1;
+ conf->uniforms[conf->num_uniforms].value[1] = v2;
+ conf->uniforms[conf->num_uniforms].value[2] = v3;
+ conf->uniforms[conf->num_uniforms].value[3] = v4;
+ conf->uniforms[conf->num_uniforms].type = type;
+ conf->num_uniforms++;
+ }
+ else {
+ if (strlen(line) > 1) {
+ fprintf(stderr, "syntax error in: %s\n", line);
+ break;
+ }
+ }
+ }
+ }
+
+ fclose(f);
+}
+
+
+static void
+Init(void)
+{
+ struct config_file config;
+ memset(&config, 0, sizeof(config));
+
+ if (ConfigFile)
+ ReadConfigFile(ConfigFile, &config);
+
+ if (!VertShaderFile) {
+ fprintf(stderr, "Error: no vertex shader\n");
+ exit(1);
+ }
+
+ if (!FragShaderFile) {
+ fprintf(stderr, "Error: no fragment shader\n");
+ exit(1);
+ }
+
+ if (!ShadersSupported())
+ exit(1);
+
+ vertShader = CompileShaderFile(GL_VERTEX_SHADER, VertShaderFile);
+ fragShader = CompileShaderFile(GL_FRAGMENT_SHADER, FragShaderFile);
+ Program = LinkShaders(vertShader, fragShader);
+
+ glUseProgram(Program);
+
+ NumUniforms = GetUniforms(Program, Uniforms);
+ if (config.num_uniforms) {
+ InitUniforms(&config, Uniforms);
+ }
+ else {
+ RandomUniformValues();
+ }
+ SetUniformValues(Program, Uniforms);
+ PrintUniforms(Uniforms);
+
+ NumAttribs = GetAttribs(Program, Attribs);
+ PrintAttribs(Attribs);
+
+ //assert(glGetError() == 0);
+
+ glClearColor(0.4f, 0.4f, 0.8f, 0.0f);
+
+ glEnable(GL_DEPTH_TEST);
+
+ glColor3f(1, 0, 0);
+}
+
+
+static void
+Keys(void)
+{
+ printf("Keyboard:\n");
+ printf(" a Animation toggle\n");
+ printf(" r Randomize uniform values\n");
+ printf(" o Change object\n");
+ printf(" arrows Rotate object\n");
+ printf(" ESC Exit\n");
+}
+
+
+static void
+Usage(void)
+{
+ printf("Usage:\n");
+ printf(" shtest config.shtest\n");
+ printf(" Run w/ given config file.\n");
+ printf(" shtest --vs vertShader --fs fragShader\n");
+ printf(" Load/compile given shaders.\n");
+}
+
+
+static void
+ParseOptions(int argc, char *argv[])
+{
+ int i;
+
+ if (argc == 1) {
+ Usage();
+ exit(1);
+ }
+
+ for (i = 1; i < argc; i++) {
+ if (strcmp(argv[i], "--fs") == 0) {
+ FragShaderFile = argv[i+1];
+ i++;
+ }
+ else if (strcmp(argv[i], "--vs") == 0) {
+ VertShaderFile = argv[i+1];
+ i++;
+ }
+ else {
+ /* assume the arg is a config file */
+ ConfigFile = argv[i];
+ break;
+ }
+ }
+}
+
+
+int
+main(int argc, char *argv[])
+{
+ glutInit(&argc, argv);
+ glutInitWindowPosition( 0, 0);
+ glutInitWindowSize(400, 400);
+ glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
+ win = glutCreateWindow(argv[0]);
+ glewInit();
+ glutReshapeFunc(Reshape);
+ glutKeyboardFunc(Key);
+ glutSpecialFunc(SpecialKey);
+ glutDisplayFunc(Redisplay);
+ ParseOptions(argc, argv);
+ Init();
+ Keys();
+ glutMainLoop();
+ return 0;
+}
+
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