+++ /dev/null
-/*
- * Test floating point textures.
- */
-
-
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <GL/glew.h>
-#include <GL/glut.h>
-#include "extfuncs.h"
-#include "readtex.h"
-#include "shaderutil.h"
-
-
-static const char *TexFile = "../images/arch.rgb";
-
-static const char *FragShaderText =
- "uniform sampler2D tex1; \n"
- "void main() \n"
- "{ \n"
- " vec4 t = texture2D(tex1, gl_TexCoord[0].xy); \n"
- " // convert from [-255,0] to [0,1] \n"
- " gl_FragColor = t * (-1.0 / 255.0); \n"
- "} \n";
-
-static const char *VertShaderText =
- "void main() \n"
- "{ \n"
- " gl_TexCoord[0] = gl_MultiTexCoord0; \n"
- " gl_Position = ftransform(); \n"
- "} \n";
-
-static struct uniform_info Uniforms[] = {
- { "tex1", 1, GL_SAMPLER_2D, { 0, 0, 0, 0 }, -1 },
- END_OF_UNIFORMS
-};
-
-
-static GLuint Program;
-
-
-
-static GLboolean
-CheckError( int line )
-{
- GLenum error = glGetError();
- if (error) {
- char *err = (char *) gluErrorString( error );
- fprintf( stderr, "GL Error: %s at line %d\n", err, line );
- return GL_TRUE;
- }
- return GL_FALSE;
-}
-
-
-static void
-Draw(void)
-{
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
- glPushMatrix();
-
- glBegin(GL_POLYGON);
- glTexCoord2f( 0.0, 0.0 ); glVertex2f( -1.0, -1.0 );
- glTexCoord2f( 1.0, 0.0 ); glVertex2f( 1.0, -1.0 );
- glTexCoord2f( 1.0, 1.0 ); glVertex2f( 1.0, 1.0 );
- glTexCoord2f( 0.0, 1.0 ); glVertex2f( -1.0, 1.0 );
- glEnd();
-
- 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(0.0, 0.0, -8.0);
-}
-
-
-static void
-Key(unsigned char key, int x, int y)
-{
- (void) x;
- (void) y;
- switch (key) {
- case 27:
- exit(0);
- break;
- }
- glutPostRedisplay();
-}
-
-
-static void
-InitTexture(void)
-{
- GLenum filter = GL_LINEAR;
- GLint imgWidth, imgHeight;
- GLenum imgFormat;
- GLubyte *image = NULL;
- GLfloat *ftex;
- GLint i, t;
-
- image = LoadRGBImage(TexFile, &imgWidth, &imgHeight, &imgFormat);
- if (!image) {
- printf("Couldn't read %s\n", TexFile);
- exit(0);
- }
-
- assert(imgFormat == GL_RGB);
-
- ftex = (float *) malloc(imgWidth * imgHeight * 4 * sizeof(float));
- if (!ftex) {
- printf("out of memory\n");
- exit(0);
- }
-
- /* convert ubytes to floats, negated */
- for (i = 0; i < imgWidth * imgHeight * 3; i++) {
- ftex[i] = -1.0f * image[i];
- }
-
- glActiveTexture(GL_TEXTURE0);
- glBindTexture(GL_TEXTURE_2D, 42);
-
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F_ARB,
- imgWidth, imgHeight, 0,
- GL_RGB, GL_FLOAT, ftex);
-
-
- CheckError(__LINE__);
-
- /* sanity checks */
- glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_RED_TYPE_ARB, &t);
- assert(t == GL_FLOAT);
- glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_GREEN_TYPE_ARB, &t);
- assert(t == GL_FLOAT);
- glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_BLUE_TYPE_ARB, &t);
- assert(t == GL_FLOAT);
- glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_ALPHA_TYPE_ARB, &t);
- assert(t == GL_FLOAT);
-
- free(image);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
-
- if (1) {
- /* read back the texture and make sure values are correct */
- GLfloat *tex2 = (GLfloat *)
- malloc(imgWidth * imgHeight * 4 * sizeof(GLfloat));
- glGetTexImage(GL_TEXTURE_2D, 0, imgFormat, GL_FLOAT, tex2);
- CheckError(__LINE__);
- for (i = 0; i < imgWidth * imgHeight * 4; i++) {
- if (ftex[i] != tex2[i]) {
- printf("tex[%d] %g != tex2[%d] %g\n",
- i, ftex[i], i, tex2[i]);
- }
- }
- }
-
- free(ftex);
-}
-
-
-static GLuint
-CreateProgram(void)
-{
- GLuint fragShader, vertShader, program;
-
- vertShader = CompileShaderText(GL_VERTEX_SHADER, VertShaderText);
- fragShader = CompileShaderText(GL_FRAGMENT_SHADER, FragShaderText);
- assert(vertShader);
- program = LinkShaders(vertShader, fragShader);
-
- assert(program);
-
- glUseProgram_func(program);
-
- SetUniformValues(program, Uniforms);
-
- return program;
-}
-
-
-static void
-Init(void)
-{
- glClearColor(0.25, 0.25, 0.25, 0.0);
-
- GetExtensionFuncs();
-
- if (!ShadersSupported()) {
- printf("Sorry, this test requires GLSL\n");
- exit(1);
- }
-
- if (!glutExtensionSupported("GL_MESAX_texture_float") &&
- !glutExtensionSupported("GL_ARB_texture_float")) {
- printf("Sorry, this test requires GL_MESAX/ARB_texture_float\n");
- exit(1);
- }
-
- InitTexture();
-
- Program = CreateProgram();
- glUseProgram_func(Program);
-}
-
-
-int
-main(int argc, char *argv[])
-{
- glutInit(&argc, argv);
- glutInitWindowPosition(0, 0);
- glutInitWindowSize(400, 400);
- glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
- glutCreateWindow(argv[0]);
- glewInit();
- glutReshapeFunc(Reshape);
- glutKeyboardFunc(Key);
- glutDisplayFunc(Draw);
- Init();
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff