Hello! I'm trying to render textures at different z indices, by assigning values through my shaders. I've tested that I am able to successfully set my uniform values prior to running my shader program. Here is my attempt at setting the z-index in my vertex shader:
#version 140
in vec2 position;
in vec2 textureCoords;
out vec4 color;
out vec2 uvCoords;
uniform float zIndex;
uniform vec4 matColor;
uniform mat4 projection;
uniform vec4 offset;
uniform vec2 pixelScale;
uniform vec2 screenPosition;
void main()
{
color = matColor;
gl_Position = projection * vec4((position * pixelScale) + screenPosition, 0, 1);
gl_Position.z = zIndex;
uvCoords = (textureCoords * offset.zw) + offset.xy;
}
I am fairly certain that this is indeed setting the z-index properly, since if I set it to an out-of-bounds value (e.g. 1.01f), it causes textures rendered at that value to disappear. This, and some google searches, makes me think that I'm missing some way of enabling depth-testing... Here is the code I'm using to (try to) enable depth testing:
glEnable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
glEnable(GL_ALPHA_TEST);
glDepthFunc(GL_LESS);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
I've tried disabling GL_BLEND, as some search results suggested, but this has not done the trick. What am I missing here?
Thanks!
I figured out the problem--I was disabling depth testing elsewhere in my code. :-[