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POOpenGL Uniform buffers?
 

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    <p>I'm trying to use uniform buffers but it doesn't work as supposed. I have two uniform buffers, one is lighting and the other is for material. The problem is that the colors aren't what they are supposed to be and they change every time I move the camera. This problem didn't exist when I used normal uniforms. Here's pictures to show what I mean: <a href="http://localhostr.com/files/tMmz1e1/OpenGL.png">When using uniform buffers</a> and <a href="http://localhostr.com/files/uXxothg/OpenGL.png">when using normal uniforms</a>!</p> <p>This is my fragment shader: </p> <pre><code>#version 400 // Fragment Shader uniform layout(std140); in vec3 EyePosition; in vec3 EyeNormal; in vec2 TexCoord; out vec4 FragColor; uniform sampler2D Texture; uniform LightBlock { vec4 Position; vec4 Intensity; } Light; uniform MaterialBlock { vec4 Ambient; vec4 Diffuse; } Material; vec4 PointLight(in int i, in vec3 ECPosition, in vec3 ECNormal) { vec3 n = normalize(ECNormal); vec3 s = normalize(Light.Position.xyz - ECPosition); return Light.Intensity * (Material.Ambient + Material.Diffuse * max(dot(s, n), 0.0)); } void main() { FragColor = texture(Texture, TexCoord); FragColor *= PointLight(0, EyePosition, EyeNormal); } </code></pre> <p>I'm not sure I have done everything right but here's how I create the uniform buffers:</p> <pre><code>glGenBuffers(1, &amp;light_buffer); glGenBuffers(1, &amp;material_buffer); glBindBuffer(GL_UNIFORM_BUFFER, light_buffer); glBufferData(GL_UNIFORM_BUFFER, sizeof(LightBlock), nullptr, GL_DYNAMIC_DRAW); glBindBuffer(GL_UNIFORM_BUFFER, material_buffer); glBufferData(GL_UNIFORM_BUFFER, sizeof(MaterialBlock), nullptr, GL_DYNAMIC_DRAW); GLuint program = Shaders.GetProgram(); light_index = glGetUniformBlockIndex(program, "LightBlock"); material_index = glGetUniformBlockIndex(program, "MaterialBlock"); glUniformBlockBinding(program, light_index, 0); glUniformBlockBinding(program, material_index, 1); glBindBufferBase(GL_UNIFORM_BUFFER, 0, light_buffer); glBindBufferBase(GL_UNIFORM_BUFFER, 1, material_buffer); </code></pre> <p>EDIT: Here's how I fill the buffers:</p> <pre><code>// Global structures struct LightBlock { Vector4 Position; // Vector4 is a vector class I made Vector4 Intensity; }; struct MaterialBlock { Vector4 Ambient; Vector4 Diffuse; }; // This is called for every object rendered LightBlock Light; Light.Position = Vector3(0.0f, 5.0f, 5.0f) * Camera.GetCameraMatrix(); Light.Intensity = Vector4(1.0f); glBindBuffer(GL_UNIFORM_BUFFER, light_buffer); glBufferSubData(GL_UNIFORM_BUFFER, 0, sizeof(LightBlock), &amp;Light); MaterialBlock Material; Material.Diffuse = Vector4(1.0f); Material.Ambient = Material.Diffuse * Vector4(0.3f); glBindBuffer(GL_UNIFORM_BUFFER, material_buffer); glBufferSubData(GL_UNIFORM_BUFFER, 0, sizeof(MaterialBlock), &amp;Material); </code></pre>
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    1. COWhat have you done to debug this? Have you tried printing out what values you get in the shader (by simply writing them as the fragment shader output)? At least with the colors, you should be able to see which values aren't coming out as you expect.
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    2. COAlso, where's the code that you use to fill those buffers with values?
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    3. CO@Gigi: I haven't seen this on the Cat 12.1's. It seems to work fine for me, and I use 2 blocks in my fragment shader. Also, have you filed bug reports on this?
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