diff options
author | Brian Paul <brianp@vmware.com> | 2009-02-10 16:44:02 -0700 |
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committer | Brian Paul <brianp@vmware.com> | 2009-02-10 16:44:02 -0700 |
commit | 5340b6dff73a0a23531ce2a5f28fba8303adab6e (patch) | |
tree | b141fc3648568dd8b941c966059e6ed32a8bd0ad /progs/trivial/readpixels.c | |
parent | 9fd26daec24f21dbe17afcb2e2ab272667ee9a69 (diff) | |
parent | ee4c921b65fb76998711f3c40330505cbc49a0e0 (diff) |
Merge commit 'origin/gallium-master-merge'
This is the big merge of the gallium-0.2 branch into master.
gallium-master-merge was just the staging area for it.
Both gallium-0.2 and gallium-master-merge are considered closed now.
Conflicts:
progs/demos/Makefile
src/mesa/main/state.c
src/mesa/main/texenvprogram.c
Diffstat (limited to 'progs/trivial/readpixels.c')
-rw-r--r-- | progs/trivial/readpixels.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/progs/trivial/readpixels.c b/progs/trivial/readpixels.c new file mode 100644 index 0000000000..88aac2684a --- /dev/null +++ b/progs/trivial/readpixels.c @@ -0,0 +1,103 @@ +/* + * glRead/DrawPixels test + */ + + +#include <GL/glew.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <GL/glut.h> + +static int Width = 250, Height = 250; +static GLfloat Zoom = 1.0; + +static void Init(void) +{ + fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); + fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION)); + fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR)); + glClearColor(0.3, 0.1, 0.3, 0.0); +} + +static void Reshape(int width, int height) +{ + Width = width / 2; + Height = height; + /* draw on left half (we'll read that area) */ + glViewport(0, 0, Width, height); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); + glMatrixMode(GL_MODELVIEW); +} + +static void Key(unsigned char key, int x, int y) +{ + switch (key) { + case 27: + exit(0); + default: + return; + } + glutPostRedisplay(); +} + +static void Draw(void) +{ + GLfloat *image = (GLfloat *) malloc(Width * Height * 4 * sizeof(GLfloat)); + + glClear(GL_COLOR_BUFFER_BIT); + + glBegin(GL_TRIANGLES); + glColor3f(.8,0,0); + glVertex3f(-0.9, -0.9, -30.0); + glColor3f(0,.9,0); + glVertex3f( 0.9, -0.9, -30.0); + glColor3f(0,0,.7); + glVertex3f( 0.0, 0.9, -30.0); + glEnd(); + + glBegin(GL_QUADS); + glColor3f(1, 1, 1); + glVertex2f(-1.0, -1.0); + glVertex2f(-0.9, -1.0); + glVertex2f(-0.9, -0.9); + glVertex2f(-1.0, -0.9); + glEnd(); + + glReadPixels(0, 0, Width, Height, GL_RGBA, GL_FLOAT, image); + printf("Pixel(0,0) = %f, %f, %f, %f\n", + image[0], image[1], image[2], image[3]); + /* draw to right half of window */ + glWindowPos2iARB(Width, 0); + glPixelZoom(Zoom, Zoom); + glDrawPixels(Width, Height, GL_RGBA, GL_FLOAT, image); + free(image); + + glutSwapBuffers(); +} + +int main(int argc, char **argv) +{ + glutInit(&argc, argv); + glutInitWindowPosition(0, 0); + glutInitWindowSize(Width*2, Height); + glutInitDisplayMode(GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE); + if (glutCreateWindow(argv[0]) == GL_FALSE) { + exit(1); + } + + if (argc > 1) + Zoom = atof(argv[1]); + + glewInit(); + + Init(); + + glutReshapeFunc(Reshape); + glutKeyboardFunc(Key); + glutDisplayFunc(Draw); + glutMainLoop(); + return 0; +} |