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/* Copyright (c) 2011 Dave Airlie
based on vbo-drawarrays.c, which should be MIT licensed */
/* Basic VBO testing ARB_vertex_type_2_10_10_10_rev */
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <glad/glad.h>
#include "glut_wrap.h"
GLboolean bgra = GL_FALSE;
#define i32to10(x) ((x) >= 0 ? (x & 0x1ff) : 1024-(abs((x))& 0x1ff))
#define i32to2(x) ((x) >= 0 ? (x & 0x1) : 3-abs((x)))
static unsigned iconv(int x, int y, int z, int w)
{
unsigned val;
val = i32to10(x);
val |= i32to10(y) << 10;
val |= i32to10(z) << 20;
val |= i32to2(w) << 30;
return val;
}
#define conv(x,y,z,w) (((x) & 0x3ff) | ((y) & 0x3ff) << 10 | ((z) & 0x3ff)<< 20 | ((w) & 0x3) << 30)
struct {
GLuint pos;
GLuint color;
} verts[3];
#define XYVAL 90
#define ZVAL -30
#define COLVAL 820
static void SetupVerts(void)
{
verts[0].pos = iconv(-XYVAL, -XYVAL, ZVAL, 1);
verts[0].color = conv(COLVAL, 0, 0, 0);
verts[1].pos = iconv(XYVAL, -XYVAL, ZVAL, 1);
verts[1].color = conv(0, COLVAL, 0, 0);
verts[2].pos = iconv(0, XYVAL, ZVAL, 1);
verts[2].color = conv(0, 0, COLVAL, 0);
}
GLuint arrayObj, elementObj;
static void Init( void )
{
GLint errnum;
GLuint prognum;
int color_size = 4;
static const char *prog1 =
"!!ARBvp1.0\n"
"PARAM mvp[4] = {state.matrix.mvp};\n"
"DP4 result.position.x, vertex.position, mvp[0]; \n"
"DP4 result.position.y, vertex.position, mvp[1]; \n"
"DP4 result.position.z, vertex.position, mvp[2]; \n"
"DP4 result.position.w, vertex.position, mvp[3]; \n"
"MOV result.color, vertex.color;\n"
"END\n";
#ifndef GL_ARB_vertex_type_2_10_10_10_rev
fprintf(stderr,"built without ARB_vertex_type_2_10_10_10_rev\n");
exit(1);
#endif
if (!glutExtensionSupported("GL_ARB_vertex_type_2_10_10_10_rev")){
fprintf(stderr,"requires ARB_vertex_type_2_10_10_10_rev\n");
exit(1);
}
glGenProgramsARB(1, &prognum);
glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
strlen(prog1), (const GLubyte *) prog1);
assert(glIsProgramARB(prognum));
errnum = glGetError();
if (errnum != GL_NO_ERROR)
{
GLint errorpos;
glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
printf("errorpos: %d\n", errorpos);
printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
}
glEnableClientState( GL_VERTEX_ARRAY );
glEnableClientState( GL_COLOR_ARRAY );
SetupVerts();
glGenBuffersARB(1, &arrayObj);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, arrayObj);
glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts), verts, GL_STATIC_DRAW_ARB);
if (bgra)
color_size = GL_BGRA;
#ifdef GL_ARB_vertex_type_2_10_10_10_rev
glVertexPointer( 4, GL_INT_2_10_10_10_REV, sizeof(verts[0]), 0 );
glColorPointer( color_size, GL_UNSIGNED_INT_2_10_10_10_REV, sizeof(verts[0]), (void *)(sizeof(unsigned int)) );
#endif
}
static void Display( void )
{
glClearColor(0.3, 0.3, 0.3, 1);
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glEnable(GL_VERTEX_PROGRAM_ARB);
glDrawArrays( GL_TRIANGLES, 0, 3 );
glFlush();
}
static void Reshape( int width, int height )
{
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho(-100.0, 100.0, -100.0, 100.0, -0.5, 1000.0);
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
}
static void Key( unsigned char key, int x, int y )
{
(void) x;
(void) y;
switch (key) {
case 27:
exit(0);
break;
}
glutPostRedisplay();
}
static GLenum Args(int argc, char **argv)
{
GLint i;
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-bgra") == 0) {
bgra = GL_TRUE;
} else {
fprintf(stderr, "%s (Bad option).\n", argv[i]);
return GL_FALSE;
}
}
return GL_TRUE;
}
int main( int argc, char *argv[] )
{
glutInit( &argc, argv );
if (Args(argc, argv) == GL_FALSE) {
exit(1);
}
glutInitWindowPosition( 0, 0 );
glutInitWindowSize( 250, 250 );
glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
glutCreateWindow(argv[0]);
gladLoadGL();
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
glutDisplayFunc( Display );
gladLoadGL();
Init();
glutMainLoop();
return 0;
}
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