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demos: extend glsl/multitex.c to use a vertex buffer object

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This commit is contained in:
Brian Paul 2009-05-22 13:12:28 -06:00
parent 96370113f1
commit 891a2bdd7d
1 changed files with 87 additions and 6 deletions
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93
progs/glsl/multitex.c
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@ -51,6 +51,8 @@ static GLfloat Xrot = 0.0, Yrot = .0, Zrot = 0.0;
static GLfloat EyeDist = 10;
static GLboolean Anim = GL_TRUE;
static GLboolean UseArrays = GL_TRUE;
static GLboolean UseVBO = GL_TRUE;
static GLuint VBO = 0;
static GLint VertCoord_attr = -1, TexCoord0_attr = -1, TexCoord1_attr = -1;
@ -76,28 +78,81 @@ static const GLfloat VertCoords[4][2] = {
};
static void
SetupVertexBuffer(void)
{
glGenBuffersARB_func(1, &VBO);
glBindBufferARB_func(GL_ARRAY_BUFFER_ARB, VBO);
glBufferDataARB_func(GL_ARRAY_BUFFER_ARB,
sizeof(VertCoords) +
sizeof(Tex0Coords) +
sizeof(Tex1Coords),
NULL,
GL_STATIC_DRAW_ARB);
/* non-interleaved vertex arrays */
glBufferSubDataARB_func(GL_ARRAY_BUFFER_ARB,
0, /* offset */
sizeof(VertCoords), /* size */
VertCoords); /* data */
glBufferSubDataARB_func(GL_ARRAY_BUFFER_ARB,
sizeof(VertCoords), /* offset */
sizeof(Tex0Coords), /* size */
Tex0Coords); /* data */
glBufferSubDataARB_func(GL_ARRAY_BUFFER_ARB,
sizeof(VertCoords) +
sizeof(Tex0Coords), /* offset */
sizeof(Tex1Coords), /* size */
Tex1Coords); /* data */
glBindBufferARB_func(GL_ARRAY_BUFFER_ARB, 0);
}
static void
DrawPolygonArray(void)
{
void *vertPtr, *tex0Ptr, *tex1Ptr;
if (UseVBO) {
glBindBufferARB_func(GL_ARRAY_BUFFER_ARB, VBO);
vertPtr = (void *) 0;
tex0Ptr = (void *) sizeof(VertCoords);
tex1Ptr = (void *) (sizeof(VertCoords) + sizeof(Tex0Coords));
}
else {
glBindBufferARB_func(GL_ARRAY_BUFFER_ARB, 0);
vertPtr = VertCoords;
tex0Ptr = Tex0Coords;
tex1Ptr = Tex1Coords;
}
if (VertCoord_attr >= 0) {
glVertexAttribPointer_func(VertCoord_attr, 2, GL_FLOAT, GL_FALSE,
0, VertCoords);
0, vertPtr);
glEnableVertexAttribArray_func(VertCoord_attr);
}
else {
glVertexPointer(2, GL_FLOAT, 0, VertCoords);
glVertexPointer(2, GL_FLOAT, 0, vertPtr);
glEnable(GL_VERTEX_ARRAY);
}
glVertexAttribPointer_func(TexCoord0_attr, 2, GL_FLOAT, GL_FALSE,
0, Tex0Coords);
0, tex0Ptr);
glEnableVertexAttribArray_func(TexCoord0_attr);
glVertexAttribPointer_func(TexCoord1_attr, 2, GL_FLOAT, GL_FALSE,
0, Tex1Coords);
0, tex1Ptr);
glEnableVertexAttribArray_func(TexCoord1_attr);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glBindBufferARB_func(GL_ARRAY_BUFFER_ARB, 0);
}
@ -163,6 +218,10 @@ key(unsigned char k, int x, int y)
UseArrays = !UseArrays;
printf("Arrays: %d\n", UseArrays);
break;
case 'v':
UseVBO = !UseVBO;
printf("Use VBO: %d\n", UseVBO);
break;
case ' ':
Anim = !Anim;
if (Anim)
@ -271,9 +330,24 @@ CreateProgram(const char *vertProgFile, const char *fragProgFile,
InitUniforms(program, uniforms);
VertCoord_attr = glGetAttribLocation_func(program, "VertCoord");
if (VertCoord_attr > 0) {
/* We want the VertCoord attrib to have position zero so that
* the call to glVertexAttrib(0, xyz) triggers vertex processing.
* Otherwise, if TexCoord0 or TexCoord1 gets position 0 we'd have
* to set that attribute last (which is a PITA to manage).
*/
glBindAttribLocation_func(program, 0, "VertCoord");
/* re-link */
glLinkProgram_func(program);
/* VertCoord_attr should be zero now */
VertCoord_attr = glGetAttribLocation_func(program, "VertCoord");
assert(VertCoord_attr == 0);
}
TexCoord0_attr = glGetAttribLocation_func(program, "TexCoord0");
TexCoord1_attr = glGetAttribLocation_func(program, "TexCoord1");
VertCoord_attr = glGetAttribLocation_func(program, "VertCoord");
printf("TexCoord0_attr = %d\n", TexCoord0_attr);
printf("TexCoord1_attr = %d\n", TexCoord1_attr);
printf("VertCoord_attr = %d\n", VertCoord_attr);
@ -299,12 +373,19 @@ InitGL(void)
/*exit(1);*/
}
printf("GL_RENDERER = %s\n",(const char *) glGetString(GL_RENDERER));
printf("Usage:\n");
printf(" a - toggle arrays vs. immediate mode rendering\n");
printf(" v - toggle VBO usage for array rendering\n");
printf(" z/Z - change viewing distance\n");
printf(" SPACE - toggle animation\n");
printf(" Esc - exit\n");
GetExtensionFuncs();
InitTextures();
InitPrograms();
SetupVertexBuffer();
glEnable(GL_DEPTH_TEST);
glClearColor(.6, .6, .9, 0);