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/*
* gldgTexture.c
*
* OpenGL Graph Display texture utility module implementation
*
* Written by: Shawn Taras
*/
#include <stdlib.h>
#include <math.h>
#include <GL/gl.h>
#include "glgd.h"
/*
* Defines
*/
#define _SQR(x) ((x) * (x))
/*
* External public functions
*/
glgdTexture
*glgdTextureCreate(void)
{
glgdTexture *tex;
tex = (glgdTexture *)GLGD_MALLOC(sizeof(glgdTexture));
if (tex)
{
glgdTextureInit(tex);
}
return tex;
}
glgdTexture
*glgdTextureDestroy(glgdTexture *tex)
{
if (tex != NULL)
{
glgdTextureFini(tex);
GLGD_FREE(tex);
}
return (glgdTexture *)NULL;
}
GLboolean
glgdTextureInit(glgdTexture *tex)
{
if (tex != NULL)
{
tex->name = 0;
tex->width = 0;
tex->height = 0;
tex->texels = NULL;
return GL_TRUE;
}
return GL_FALSE;
}
GLboolean
glgdTextureFini(glgdTexture *tex)
{
if (tex != NULL)
{
glDeleteTextures(1, &tex->name);
if (tex->texels != NULL)
{
GLGD_FREE(tex->texels);
}
glgdTextureInit(tex);
return GL_TRUE;
}
return GL_FALSE;
}
GLboolean
glgdTextureSetup(glgdTexture *tex, int width, int height)
{
GLint widthSet;
GLint heightSet;
GLvoid *texels;
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &widthSet);
glgdTrace(1, "GL_MAX_TEXTURE_SIZE = %d\n", widthSet);
/* Create the texture */
if (tex)
{
glTexImage2D(GL_PROXY_TEXTURE_2D, 0, GL_RGBA,
width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
/* Check for valid (width,height) parameters */
glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0,
GL_TEXTURE_WIDTH, &widthSet);
glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0,
GL_TEXTURE_HEIGHT, &heightSet);
if (widthSet == 0 || heightSet == 0)
{
return GL_FALSE;
}
texels = GLGD_MALLOC(width * height * 4);
memset(texels, 0, width * height * 4);
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
glGenTextures(1, &tex->name);
glBindTexture(GL_TEXTURE_2D, tex->name);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, texels);
tex->width = width;
tex->height = height;
tex->texels = texels;
return GL_TRUE;
}
return GL_FALSE;
}
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