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Diffstat (limited to 'progs/tests/getteximage.c')
| -rw-r--r-- | progs/tests/getteximage.c | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/progs/tests/getteximage.c b/progs/tests/getteximage.c new file mode 100644 index 0000000000..71f29b4ac8 --- /dev/null +++ b/progs/tests/getteximage.c @@ -0,0 +1,253 @@ +/** + * Test glGetTexImage() + * Brian Paul + * 9 June 2009 + */ + + +#include <stdio.h> +#include <stdlib.h> +#include <math.h> +#include <GL/glew.h> +#include <GL/glut.h> + +static int Win; + + +static void +TestGetTexImage(GLboolean npot) +{ + GLuint iter; + GLubyte *data = (GLubyte *) malloc(1024 * 1024 * 4); + GLubyte *data2 = (GLubyte *) malloc(1024 * 1024 * 4); + + glEnable(GL_TEXTURE_2D); + + printf("glTexImage2D + glGetTexImage:\n"); + + for (iter = 0; iter < 8; iter++) { + GLint p = (iter % 8) + 3; + GLint w = npot ? (p * 20) : (1 << p); + GLint h = npot ? (p * 10) : (1 << p); + GLuint i; + GLint level = 0; + + printf(" Testing %d x %d tex image\n", w, h); + + /* fill data */ + for (i = 0; i < w * h * 4; i++) { + data[i] = i & 0xff; + data2[i] = 0; + } + + glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, w, h, 0, + GL_RGBA, GL_UNSIGNED_BYTE, data); + + glBegin(GL_POINTS); + glVertex2f(0, 0); + glEnd(); + + /* get */ + glGetTexImage(GL_TEXTURE_2D, level, GL_RGBA, GL_UNSIGNED_BYTE, data2); + + /* compare */ + for (i = 0; i < w * h * 4; i++) { + if (data2[i] != data[i]) { + printf("glTexImage + glGetTexImage failure!\n"); + printf("Expected value %d, found %d\n", data[i], data2[i]); + abort(); + } + } + } + + printf("Passed\n"); + glDisable(GL_TEXTURE_2D); + free(data); + free(data2); +} + + +static GLboolean +ColorsEqual(const GLubyte ref[4], const GLubyte act[4]) +{ + if (abs((int) ref[0] - (int) act[0]) > 1 || + abs((int) ref[1] - (int) act[1]) > 1 || + abs((int) ref[2] - (int) act[2]) > 1 || + abs((int) ref[3] - (int) act[3]) > 1) { + printf("expected %d %d %d %d\n", ref[0], ref[1], ref[2], ref[3]); + printf("found %d %d %d %d\n", act[0], act[1], act[2], act[3]); + return GL_FALSE; + } + return GL_TRUE; +} + + +static void +TestGetTexImageRTT(GLboolean npot) +{ + GLuint iter; + + printf("Render to texture + glGetTexImage:\n"); + + for (iter = 0; iter < 8; iter++) { + + GLuint fb, tex; + GLint w, h; + GLint level = 0; + + if (npot) { + w = 200 + iter * 40; + h = 200 + iter * 12; + } + else { + w = 4 << iter; + h = 4 << iter; + } + + glGenTextures(1, &tex); + glGenFramebuffersEXT(1, &fb); + + glBindTexture(GL_TEXTURE_2D, tex); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, + GL_RGBA, GL_UNSIGNED_BYTE, NULL); + + glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb); + glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, + GL_TEXTURE_2D, tex, level); + + glViewport(0, 0, w, h); + + printf(" Testing %d x %d tex image\n", w, h); + { + static const GLubyte blue[4] = {0, 0, 255, 255}; + GLubyte color[4]; + GLubyte *data2 = (GLubyte *) malloc(w * h * 4); + GLuint i; + + /* random clear color */ + for (i = 0; i < 4; i++) { + color[i] = rand() % 256; + } + + glClearColor(color[0] / 255.0, + color[1] / 255.0, + color[2] / 255.0, + color[3] / 255.0); + + glClear(GL_COLOR_BUFFER_BIT); + + /* draw polygon over top half, in blue */ + glColor4ubv(blue); + glRectf(0, 0.5, 1.0, 1.0); + + /* get */ + glGetTexImage(GL_TEXTURE_2D, level, GL_RGBA, GL_UNSIGNED_BYTE, data2); + + /* compare */ + for (i = 0; i < w * h; i += 4) { + if (i < w * h / 2) { + /* lower half */ + if (!ColorsEqual(color, data2 + i * 4)) { + printf("Render to texture failure (expected clear color)!\n"); + abort(); + } + } + else { + /* upper half */ + if (!ColorsEqual(blue, data2 + i * 4)) { + printf("Render to texture failure (expected blue)!\n"); + abort(); + } + } + } + + free(data2); + } + + glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); + glDeleteFramebuffersEXT(1, &fb); + glDeleteTextures(1, &tex); + + } + + printf("Passed\n"); +} + + + + +static void +Draw(void) +{ + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + TestGetTexImage(GL_FALSE); + if (glutExtensionSupported("GL_ARB_texture_non_power_of_two")) + TestGetTexImage(GL_TRUE); + + if (glutExtensionSupported("GL_EXT_framebuffer_object") || + glutExtensionSupported("GL_ARB_framebuffer_object")) { + TestGetTexImageRTT(GL_FALSE); + if (glutExtensionSupported("GL_ARB_texture_non_power_of_two")) + TestGetTexImageRTT(GL_TRUE); + } + + glutDestroyWindow(Win); + exit(0); + + glutSwapBuffers(); +} + + +static void +Reshape(int width, int height) +{ + glViewport(0, 0, width, height); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(0, 1, 0, 1, -1, 1); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef(0.0, 0.0, 0.0); +} + + +static void +Key(unsigned char key, int x, int y) +{ + (void) x; + (void) y; + switch (key) { + case 27: + glutDestroyWindow(Win); + exit(0); + break; + } + glutPostRedisplay(); +} + + +static void +Init(void) +{ +} + + +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); + glutDisplayFunc(Draw); + Init(); + glutMainLoop(); + return 0; +} |