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View Full Version : Problem going from 2D texture to 2D texture array



kantoniak
03-15-2017, 03:27 PM
Hi, I wanted to use 2D texture as texture atlas for road tiles rendered on heightmap. I prepared sample plain 2D transparent texture and rendered it over ground color. I have grid texture blended over this that works fine.

Now, I wanted to use 2D_TEXTURE_ARRAY instead of this middle texture. I use this example https://www.khronos.org/opengl/wiki/Array_Texture. I copied code from tutorial and my fragment shader gets black color. There is no error when calling glGetError(), but "Error 00000502 after fill simple" is printed to console.

I failed somewhere after texture change, that's why I guess I set something wrong. What could be a problem?

Texture setup:

GLubyte texels[32] =
{
//Texels for first image.
0, 0, 0, 255,
255, 0, 0, 255,
0, 255, 0, 255,
0, 0, 255, 255,
//Texels for second image.
255, 255, 255, 255,
255, 255, 0, 255,
0, 255, 255, 255,
255, 0, 255, 255,
};

// Texture of the ground
GLenum err;
glGenTextures(1, &roadTexture);
glBindTexture(GL_TEXTURE_2D_ARRAY, roadTexture);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexStorage3D(GL_TEXTURE_2D_ARRAY, 1, GL_RGBA8, 2, 2, 2);
glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, 0, 2, 2, 2, GL_RGBA, GL_UNSIGNED_BYTE, texels);

Fragment shader:

#version 430 core

layout (binding = 0) uniform sampler2D groundTexture;
layout (binding = 1) uniform sampler2DArray roadTexture;

//...

in vec3 vPos;
out vec4 color;

void main() {
// ...
color = vec4(0.624f, 0.643f, 0.318f, 1);

vec4 roadColor = texture2DArray(roadTexture, vec3(vPos.xz, 0));
color = vec4(mix(color.xyz, roadColor.xyz, roadColor.w), 1); // color = vec4(roadColor.xyz, 1); also gives black
// ...
}