I am using freeglut, GLEW and DevIL to render a textured teapot using a vertex and fragment shader. This is all working fine in OpenGL 2.0 and GLSL 1.2 on Ubuntu 14.04.
Now, I want to apply a bump map to the teapot. My lecturer evidently doesn't brew his own tea, and so doesn't know they're supposed to be smooth. Anyway, I found a nice-looking tutorial on old-school bump mapping that includes a fragment shader that begins:
uniform sampler2D DecalTex; //The texture
uniform sampler2D BumpTex; //The bump-map
What they don't mention is how to pass two textures to the shader in the first place.
Previously I
//OpenGL cpp file
glBindTexture(GL_TEXTURE_2D, textureHandle);
//Vertex shader
gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
//Fragment shader
gl_FragColor = color * texture2D(DecalTex,gl_TexCoord[0].xy);
so now I
//OpenGL cpp file
glBindTexture(GL_TEXTURE_2D, textureHandle);
glBindTexture(GL_TEXTURE_2D, bumpHandle);
//Vertex shader
gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
gl_TexCoord[1] = gl_TextureMatrix[1] * gl_MultiTexCoord1;
//Fragment shader
gl_FragColor = color * texture2D(BumpTex,gl_TexCoord[0].xy);
//no bump logic yet, just testing I can use texture 1 instead of texture 0
but this doesn't work. The texture disappears completely (effectively the teapot is white). I've tried GL_TEXTURE_2D_ARRAY, glActiveTexture and few other likely-seeming but fruitless options.
After sifting through the usual mixed bag of references to OpenGL and GLSL new and old, I've come to the conclusion that I probably need glGetUniformLocation
. How exactly do I use this in the OpenGL cpp file to pass the already-populated texture handles to the fragment shader?
- How to pass an array of textures with different sizes to GLSL?
- Passing Multiple Textures from OpenGL to GLSL shader
- Multiple textures in GLSL - only one works
(This is homework so please answer with minimal code fragments (if at all). Thanks!)
Failing that, does anyone have a tea cosy mesh?
It is very simple, really. All you need is to bind the sampler to some texture unit with glUniform1i
. So for your code sample, assuming the two uniform samplers:
uniform sampler2D DecalTex; // The texture (we'll bind to texture unit 0)
uniform sampler2D BumpTex; // The bump-map (we'll bind to texture unit 1)
In your initialization code:
// Get the uniform variables location. You've probably already done that before...
decalTexLocation = glGetUniformLocation(shader_program, "DecalTex");
bumpTexLocation = glGetUniformLocation(shader_program, "BumpTex");
// Then bind the uniform samplers to texture units:
glUseProgram(shader_program);
glUniform1i(decalTexLocation, 0);
glUniform1i(bumpTexLocation, 1);
OK, shader uniforms set, now we render. To do so, you will need the usual glBindTexture
plus glActiveTexture
:
glActiveTexture(GL_TEXTURE0 + 0); // Texture unit 0
glBindTexture(GL_TEXTURE_2D, decalTexHandle);
glActiveTexture(GL_TEXTURE0 + 1); // Texture unit 1
glBindTexture(GL_TEXTURE_2D, bumpHandle);
// Done! Now you render normally.
And in the shader, you will use the textures samplers just like you already do:
vec4 a = texture2D(DecalTex, tc);
vec4 b = texture2D(BumpTex, tc);
Note: For techniques like bump-mapping, you only need one set of texture coordinates, since the textures are the same, only containing different data. So you should probably pass texture coordinates as a vertex attribute.
instead of using:
glUniform1i(decalTexLocation, 0);
glUniform1i(bumpTexLocation, 1);
in your code, you can have:
layout(binding=0) uniform sampler2D DecalTex;
// The texture (we'll bind to texture unit 0)
layout(binding=1)uniform sampler2D BumpTex;
// The bump-map (we'll bind to texture unit 1)
in your shader. That also mean you don't have to query for the location.
来源:https://stackoverflow.com/questions/25252512/how-can-i-pass-multiple-textures-to-a-single-shader