Texture blues
Post: #1
I am trying to render sprites:
This is in the draw method:
These are the problems:
1. The only hues in the rendered textures are blue and white.
2. The images are scaled so that their height is equal to the view's height.
How to solve these?
Code:
NSRect LoadTexture(CFStringRef name)
{
CFURLRef texture_url = CFBundleCopyResourceURL(
CFBundleGetMainBundle(),
name,
CFSTR("png"),
NULL);
CGImageSourceRef image_source = CGImageSourceCreateWithURL(
texture_url,
NULL);
CGImageRef image = CGImageSourceCreateImageAtIndex(
image_source,
0,
NULL);
unsigned width = CGImageGetWidth(image);
unsigned height = CGImageGetHeight(image);
NSRect rect;
rect.size.width = width;
rect.size.height = height;
rect.origin.x = 0;
rect.origin.y = 0;
void *data = malloc(width * height * 4);
CGColorSpaceRef color_space = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(
data,
width,
height,
8,
width * 4,
color_space,
kCGImageAlphaPremultipliedFirst);
CGContextDrawImage(
context,
CGRectMake(0, 0, width, height),
image);
GLuint texture_id;
glGenTextures(1, &texture_id);
glBindTexture(GL_TEXTURE_2D, texture_id);
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
glTexImage2D(
GL_TEXTURE_2D,
0,
GL_RGBA,
width,
height,
0,
GL_BGRA,
GL_UNSIGNED_INT_8_8_8_8_REV,
data);
glTexParameteri(
GL_TEXTURE_2D,
GL_TEXTURE_WRAP_S,
GL_CLAMP_TO_BORDER);
glTexParameteri(
GL_TEXTURE_2D,
GL_TEXTURE_MAG_FILTER,
GL_LINEAR);
glTexParameteri(
GL_TEXTURE_2D,
GL_TEXTURE_MIN_FILTER,
GL_LINEAR_MIPMAP_LINEAR);
CFRelease(context);
CFRelease(color_space);
free(data);
CFRelease(image);
CFRelease(image_source);
CFRelease(texture_url);
return rect;
}This is in the draw method:
Code:
glBegin(GL_QUADS);
glTexCoord2f( 0, spriteRect.size.height );
glVertex2f( 0, 0 );
glTexCoord2f( spriteRect.size.width, spriteRect.size.height );
glVertex2f( spriteRect.size.width, 0 );
glTexCoord2f( spriteRect.size.width, 0 );
glVertex2f( spriteRect.size.width, spriteRect.size.height );
glTexCoord2f( 0, 0 );
glVertex2f( 0, spriteRect.size.height );
glEnd();1. The only hues in the rendered textures are blue and white.
2. The images are scaled so that their height is equal to the view's height.
How to solve these?
