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OpenGL: Fix GL2 not centering image (fixes #151)

This commit is contained in:
Jeffrey Pfau 2015-11-02 22:44:35 -08:00
parent a9c94e9d18
commit 47c4eb9761
1 changed files with 16 additions and 3 deletions
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19
src/platform/opengl/gles2.c
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@ -119,7 +119,7 @@ static void GBAGLES2ContextResized(struct VideoBackend* v, int w, int h) {
drawH = w * 2 / 3;
}
}
glViewport(0, 0, 240, 160);
glViewport(0, 0, VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS);
glClearColor(0.f, 0.f, 0.f, 1.f);
glClear(GL_COLOR_BUFFER_BIT);
glViewport((w - drawW) / 2, (h - drawH) / 2, drawW, drawH);
@ -140,13 +140,26 @@ void _drawShader(struct GBAGLES2Shader* shader) {
} else {
glDisable(GL_BLEND);
}
glGetIntegerv(GL_VIEWPORT, viewport);
glViewport(0, 0, shader->width ? shader->width : viewport[2], shader->height ? shader->height : viewport[3]);
int drawW = shader->width;
int drawH = shader->height;
int padW = 0;
int padH = 0;
if (!shader->width) {
drawW = viewport[2];
padW = viewport[0];
}
if (!shader->height) {
drawH = viewport[3];
padH = viewport[1];
}
glViewport(padW, padH, drawW, drawH);
if (!shader->width || !shader->height) {
GLint oldTex;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &oldTex);
glBindTexture(GL_TEXTURE_2D, shader->tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, shader->width ? shader->width : viewport[2], shader->height ? shader->height : viewport[3], 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, drawW, drawH, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
glBindTexture(GL_TEXTURE_2D, oldTex);
}