static void
draw(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glDrawTexfOES(view_posx, view_posy, 0.0, width, height);
}
void CanvasContext::drawImage (const Texture* texture,
float destX, float destY, float sourceX, float sourceY, float sourceW, float sourceH)
{
const CanvasState& state = _states.top();
prepare(texture);
if (state.canDrawTexture) {
// Use GL draw_texture
int windowHeight;
getSize(NULL, &windowHeight);
float destW = state.scaleX * sourceW;
float destH = state.scaleY * sourceH;
GLfloat cropRect[] = {
sourceX, sourceY + sourceH, sourceW, -sourceH
};
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES, cropRect);
glDrawTexfOES(state.translateX + destX,
windowHeight - destY - destH - state.translateY,
0, destW, destH);
} else {
// Use GL vertex arrays
GLfloat verts[] = {
destX, destY,
destX + sourceW, destY,
destX, destY + sourceH,
destX + sourceW, destY + sourceH,
};
float inverseMaxU = texture->getMaxU();
float inverseMaxV = texture->getMaxV();
float x1 = sourceX/texture->getWidth() * inverseMaxU;
float y1 = sourceY/texture->getHeight() * inverseMaxV;
float x2 = x1 + sourceW/texture->getWidth() * inverseMaxU;
float y2 = y1 + sourceH/texture->getHeight() * inverseMaxV;
GLfloat uv[] = {
x1, y1,
x2, y1,
x1, y2,
x2, y2,
};
glVertexPointer(2, GL_FLOAT, 0, verts);
glTexCoordPointer(2, GL_FLOAT, 0, uv);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
}
void glDrawTexfOESLogged(GLfloat x, GLfloat y, GLfloat z, GLfloat width, GLfloat height) {
printf("glDrawTexfOES(%.2f, %.2f, %.2f, %.2f, %.2f)\n", x, y, z, width, height);
glDrawTexfOES(x, y, z, width, height);
}