+++ /dev/null
-/*
-** blendeq.c - Demonstrates the use of the blend_minmax, blend_subtract,
-** and blend_logic_op extensions using glBlendEquationEXT.
-**
-** Over a two-color backround, draw rectangles using twelve blend
-** options. The values are read back as UNSIGNED_BYTE and printed
-** in hex over each value. These values are useful for logic
-** op comparisons when channels are 8 bits deep.
-*/
-
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <GL/glew.h>
-#include <GL/glut.h>
-
-GLenum doubleBuffer;
-static int dithering = 0;
-int use11ops = 0;
-int supportlogops = 0;
-static int doPrint = 1;
-static int deltaY;
-GLint windW, windH;
-
-static const struct {
- GLenum mode;
- const char *name;
-} LogicOpModes[] = {
- { GL_SET, "GL_SET" },
- { GL_COPY, "GL_COPY" },
- { GL_NOOP, "GL_NOOP" },
- { GL_AND, "GL_AND" },
- { GL_INVERT, "GL_INVERT" },
- { GL_OR, "GL_OR" },
- { GL_XOR, "GL_XOR" },
- { GL_NOR, "GL_NOR" },
- { GL_NAND, "GL_NAND" },
- { GL_OR_REVERSE, "GL_OR_REVERSE" },
- { GL_OR_INVERTED, "GL_OR_INVERTED" },
- { GL_AND_INVERTED, "GL_AND_INVERTED" },
- { 0, NULL }
-};
-
-
-
-static void DrawString(const char *string)
-{
- int i;
-
- for (i = 0; string[i]; i++)
- glutBitmapCharacter(GLUT_BITMAP_9_BY_15, string[i]);
-}
-
-static void Init(void)
-{
-
- glDisable(GL_DITHER);
- glShadeModel(GL_FLAT);
-}
-
-static void Reshape(int width, int height)
-{
-
- windW = (GLint)width;
- windH = (GLint)height;
-
- glViewport(0, 0, (GLint)width, (GLint)height);
- deltaY = windH /20;
-
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluOrtho2D(0, windW, 0, windH);
- glMatrixMode(GL_MODELVIEW);
-}
-
-static void Key(unsigned char key, int x, int y)
-{
-
- switch (key) {
- case 27:
- exit(1);
- case 'd':
- dithering = !dithering;
- break;
- case 'l':
- if (supportlogops == 3)
- use11ops = (!use11ops);
- if (use11ops)
- printf("Using GL 1.1 color logic ops.\n");
- else printf("Using GL_EXT_blend_logic_op.\n");
- break;
- default:
- return;
- }
-
- glutPostRedisplay();
-}
-
-static void PrintColorStrings( void )
-{
- GLubyte ubbuf[3];
- int i, xleft, xright;
- char colorString[100];
-
- xleft = 5 + windW/4;
- xright = 5 + windW/2;
-
- for (i = windH - deltaY + 4; i > 0; i-=deltaY) {
- glReadPixels(xleft, i+10, 1, 1, GL_RGB, GL_UNSIGNED_BYTE, ubbuf);
- sprintf(colorString, "(0x%x, 0x%x, 0x%x)",
- ubbuf[0], ubbuf[1], ubbuf[2]);
- glRasterPos2f(xleft, i);
- DrawString(colorString);
- glReadPixels(xright, i+10, 1, 1, GL_RGB, GL_UNSIGNED_BYTE, ubbuf);
- sprintf(colorString, "(0x%x, 0x%x, 0x%x)",
- ubbuf[0], ubbuf[1], ubbuf[2]);
- glRasterPos2f(xright, i);
- DrawString(colorString);
- }
-}
-
-static void Draw(void)
-{
- int stringOffset = 5, stringx = 8;
- int x1, x2, xleft, xright;
- int i, k;
-
- (dithering) ? glEnable(GL_DITHER) : glDisable(GL_DITHER);
- glDisable(GL_BLEND);
- if (supportlogops & 2)
- glDisable(GL_COLOR_LOGIC_OP);
-
- glClearColor(0.5, 0.6, 0.1, 1.0);
- glClear(GL_COLOR_BUFFER_BIT);
-
- /* Draw background */
- glColor3f(0.1, 0.1, 1.0);
- glRectf(0.0, 0.0, windW/2, windH);
-
- /* Draw labels */
- glColor3f(0.8, 0.8, 0.0);
- i = windH - deltaY + stringOffset;
-
- glRasterPos2f(stringx, i); i -= deltaY;
- DrawString("SOURCE");
- glRasterPos2f(stringx, i); i -= deltaY;
- DrawString("DEST");
- glRasterPos2f(stringx, i); i -= deltaY;
- DrawString("min");
- glRasterPos2f(stringx, i); i -= deltaY;
- DrawString("max");
- glRasterPos2f(stringx, i); i -= deltaY;
- DrawString("subtract");
- glRasterPos2f(stringx, i); i -= deltaY;
- DrawString("reverse_subtract");
- glRasterPos2f(stringx, i); i -= deltaY;
- DrawString("clear");
-
- for (k = 0; LogicOpModes[k].name; k++) {
- glRasterPos2f(stringx, i);
- i -= deltaY;
- DrawString(LogicOpModes[k].name);
- }
-
- i = windH - deltaY;
- x1 = windW/4;
- x2 = 3 * windW/4;
- xleft = 5 + windW/4;
- xright = 5 + windW/2;
-
- /* Draw foreground color for comparison */
- glColor3f(0.9, 0.2, 0.8);
- glRectf(x1, i, x2, i+deltaY);
-
- /* Leave one rectangle of background color */
-
- /* Begin test cases */
- glEnable(GL_BLEND);
- glBlendFunc(GL_ONE, GL_ONE);
-
- i -= 2*deltaY;
- glBlendEquationEXT(GL_MIN_EXT);
- glRectf(x1, i, x2, i+deltaY);
-
- i -= deltaY;
- glBlendEquationEXT(GL_MAX_EXT);
- glRectf(x1, i, x2, i+deltaY);
-
- i -= deltaY;
- glBlendEquationEXT(GL_FUNC_SUBTRACT_EXT);
- glRectf(x1, i, x2, i+deltaY);
-
- i -= deltaY;
- glBlendEquationEXT(GL_FUNC_REVERSE_SUBTRACT_EXT);
- glRectf(x1, i, x2, i+deltaY);
-
- glBlendFunc(GL_ONE, GL_ZERO);
- i -= deltaY;
- if (!use11ops)
- glBlendEquationEXT(GL_LOGIC_OP);
- else
- glEnable(GL_COLOR_LOGIC_OP);
- glLogicOp(GL_CLEAR);
- glRectf(x1, i, x2, i+deltaY);
-
- for (k = 0; LogicOpModes[k].name; k++) {
- i -= deltaY;
- glLogicOp(LogicOpModes[k].mode);
- glRectf(x1, i, x2, i+deltaY);
- if (LogicOpModes[k].mode == GL_XOR) {
- glRectf(x1, i+10, x2, i+5);
- }
- }
-
- if (doPrint) {
- glDisable(GL_BLEND);
- if (supportlogops & 2)
- glDisable(GL_COLOR_LOGIC_OP);
- glColor3f(1.0, 1.0, 1.0);
- PrintColorStrings();
- }
- glFlush();
-
- if (doubleBuffer) {
- glutSwapBuffers();
- }
-
-}
-
-static GLenum Args(int argc, char **argv)
-{
- GLint i;
-
- doubleBuffer = GL_FALSE;
-
- for (i = 1; i < argc; i++) {
- if (strcmp(argv[i], "-sb") == 0) {
- doubleBuffer = GL_FALSE;
- } else if (strcmp(argv[i], "-db") == 0) {
- doubleBuffer = GL_TRUE;
- } else {
- printf("%s (Bad option).\n", argv[i]);
- return GL_FALSE;
- }
- }
- return GL_TRUE;
-}
-
-int main(int argc, char **argv)
-{
- GLenum type;
- char *s;
- char *extName1 = "GL_EXT_blend_logic_op";
- char *extName2 = "GL_EXT_blend_minmax";
- char *extName3 = "GL_EXT_blend_subtract";
- char *version;
-
- glutInit(&argc, argv);
-
- if (Args(argc, argv) == GL_FALSE) {
- exit(1);
- }
-
- glutInitWindowPosition(0, 0); glutInitWindowSize( 800, 520);
-
- type = GLUT_RGB;
- type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
- glutInitDisplayMode(type);
-
- if (glutCreateWindow("Blend Equation") == GL_FALSE) {
- exit(1);
- }
-
- glewInit();
-
- /* Make sure blend_logic_op extension is there. */
- s = (char *) glGetString(GL_EXTENSIONS);
- version = (char*) glGetString(GL_VERSION);
- if (!s)
- exit(1);
- if (strstr(s,extName1)) {
- supportlogops = 1;
- use11ops = 0;
- printf("blend_logic_op extension available.\n");
- }
- if (strncmp(version,"1.1",3)>=0) {
- supportlogops += 2;
- use11ops = 1;
- printf("1.1 color logic ops available.\n");
- }
- if (supportlogops == 0) {
- printf("Blend_logic_op extension and GL 1.1 not present.\n");
- exit(1);
- }
- if (strstr(s,extName2) == 0) {
- printf("Blend_minmax extension is not present.\n");
- exit(1);
- }
- if (strstr(s,extName3) == 0) {
- printf("Blend_subtract extension is not present.\n");
- exit(1);
- }
-
- Init();
-
- glutReshapeFunc(Reshape);
- glutKeyboardFunc(Key);
- glutDisplayFunc(Draw);
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff