Shader::~Shader(void)
{
GET_CONTEXT();
unUse();
glDeleteProgram(m_program);
}
void GLTexture::draw()
{
use();
glPushAttrib(GL_VIEWPORT_BIT);
glViewport(0,0, m_width, m_height);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glMatrixMode (GL_PROJECTION);
glPushMatrix();
glLoadIdentity ();
glMatrixMode (GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex2f(-1.0f, -1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex2f( 1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex2f( 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex2f(-1.0f, 1.0f);
glEnd();
glMatrixMode (GL_PROJECTION);
glPopMatrix();
glMatrixMode (GL_MODELVIEW);
glPopMatrix();
glPopAttrib();
unUse();
printOpenGLError();
}
bool Texture::load(char* fileName)
{
glActiveTexture(GL_TEXTURE1);
glGenTextures(1, &m_textureID);
glBindTexture(GL_TEXTURE_2D, m_textureID);
int bytesPerPixel = 0;
unsigned char* data = stbi_load(fileName, &m_width, &m_heigth, &bytesPerPixel, 0);
//flip image vertically
unsigned char* s = data;
for (int y = 0; y<m_heigth / 2; y++)
{
unsigned char* e = data + (m_heigth - y - 1)*m_width*bytesPerPixel;
for (int x = 0; x<m_width*bytesPerPixel; x++)
{
unsigned char temp = *s;
*s = *e;
*e = temp;
s++;
e++;
}
}
//send image data to the new texture
if (bytesPerPixel < 3)
{
printf("ERROR: Unable to load texture image %s\n", fileName);
return false;
}
else if (bytesPerPixel == 3)
{
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, m_width, m_heigth, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
}
else if (bytesPerPixel == 4)
{
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, m_width, m_heigth, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
}
else
{
printf("RESOLVED: Unknown format for bytes per pixel in texture image %s, changed to 4\n", fileName);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, m_width, m_heigth, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
}
stbi_image_free(data);
glGenerateMipmap(GL_TEXTURE_2D);
printf("SUCCESS: Texture image %s loaded\n", filepath);
unUse();
return true;
}
void GLTexture::setGLTextureParameter(GLenum target, GLenum pname, GLfloat param)
{
use();
glTexParameterf(target, pname, param);
unUse();
}
