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EMI: Flip y coordinate when creating screenshot textures

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The MakeScreenTextures() opcode is used to create texture tiles from the
current screen content for use with an overworld actor, e.g. when fading over
the slides in the intro. With OpenGL the created textures were mirrorered in
y direction because OpenGL uses a different coordinate system where (0, 0)
is the bottom left corner.
This commit is contained in:
Ingo van Lil 2013-12-18 22:41:33 +01:00
parent 9edcb2fd67
commit ea6ffdb934
1 changed files with 17 additions and 8 deletions
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25
engines/grim/gfx_opengl.cpp
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@ -1846,32 +1846,41 @@ void GfxOpenGL::drawPolygon(const PrimitiveObject *primitive) {
glEnable(GL_LIGHTING);
}
static void readPixels(int x, int y, int width, int height, char *buffer) {
char *p = buffer;
for (int i = y; i < y + height; i++) {
glReadPixels(x, 479 - i, width, 1, GL_RGBA, GL_UNSIGNED_BYTE, p);
p += width * 4;
}
}
void GfxOpenGL::createSpecialtyTextures() {
//make a buffer big enough to hold any of the textures
char *buffer = new char[256 * 256 * 4];
glReadPixels(0, 0, 256, 256, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
// TODO: Handle screen resolutions other than 640 x 480
readPixels(0, 0, 256, 256, buffer);
_specialty[0].create(buffer, 256, 256);
glReadPixels(256, 0, 256, 256, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
readPixels(256, 0, 256, 256, buffer);
_specialty[1].create(buffer, 256, 256);
glReadPixels(512, 0, 128, 128, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
readPixels(512, 0, 128, 128, buffer);
_specialty[2].create(buffer, 128, 128);
glReadPixels(512, 128, 128, 128, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
readPixels(512, 128, 128, 128, buffer);
_specialty[3].create(buffer, 128, 128);
glReadPixels(0, 256, 256, 256, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
readPixels(0, 256, 256, 256, buffer);
_specialty[4].create(buffer, 256, 256);
glReadPixels(256, 256, 256, 256, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
readPixels(256, 256, 256, 256, buffer);
_specialty[5].create(buffer, 256, 256);
glReadPixels(512, 256, 128, 128, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
readPixels(512, 256, 128, 128, buffer);
_specialty[6].create(buffer, 128, 128);
glReadPixels(512, 384, 128, 128, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
readPixels(512, 384, 128, 128, buffer);
_specialty[7].create(buffer, 128, 128);
delete[] buffer;