org.lwjgl.opengl.AMDVertexShaderTessellator Maven / Gradle / Ivy
/*
* Copyright LWJGL. All rights reserved.
* License terms: https://www.lwjgl.org/license
* MACHINE GENERATED FILE, DO NOT EDIT
*/
package org.lwjgl.opengl;
import org.lwjgl.system.*;
import static org.lwjgl.system.Checks.*;
/**
* Native bindings to the AMD_vertex_shader_tessellator extension.
*
* The vertex shader tessellator gives new flexibility to the shader author to shade at a tessellated vertex, rather than just at a provided vertex.
*
* In unextended vertex shading, the built-in attributes such as gl_Vertex, gl_Normal, and gl_MultiTexcoord0, together with the user defined attributes,
* are system provided values which are initialized prior to vertex shader invocation.
*
* With vertex shading tessellation, additional vertex shader special values are available:
*
*
* ivec3 gl_VertexTriangleIndex; // indices of the three control
* // points for the vertex
* vec3 gl_BarycentricCoord; // barycentric coordinates
* // of the vertex
*
* i o
* |\
* | \
* *--*
* |\ |\
* | \| \
* *--*--*
* |\ |\ |\
* | \| \| \
* j o--*--*--o k
*
* Figure 1 A Tessellated Triangle
* o = control point (and tessellated vertex)
* * = tessellated vertex
*
* ivec4 gl_VertexQuadIndex; // indices for the four control
* // points for the vertex
* vec2 gl_UVCoord; // UV coordinates of the vertex
*
* i o--*--*--o k
* |\ |\ |\ |
* | \| \| \|
* *--*--*--*
* |\ |\ |\ |
* | \| \| \|
* *--*--*--*
* |\ |\ |\ |
* | \| \| \|
* j o--*--*--o l
*
* Figure 2 A Tessellated Quad
* o = control point (and tessellated vertex)
* * = tessellated vertex
When this extension is enabled, conventional built-in attributes and user defined attributes are uninitialized. The shader writer is responsible for
* explicitly fetching all other vertex data either from textures, uniform buffers, or vertex buffers.
*
* The shader writer is further responsible for interpolating the vertex data at the given barycentric coordinates or uv coordinates of the vertex.
*
* Requires {@link GL20 OpenGL 2.0}.
*/
public class AMDVertexShaderTessellator {
/** Returned by the {@code type} parameter of GetActiveUniform. */
public static final int
GL_SAMPLER_BUFFER_AMD = 0x9001,
GL_INT_SAMPLER_BUFFER_AMD = 0x9002,
GL_UNSIGNED_INT_SAMPLER_BUFFER_AMD = 0x9003;
/** Accepted by TessellationModeAMD. */
public static final int
GL_DISCRETE_AMD = 0x9006,
GL_CONTINUOUS_AMD = 0x9007;
/** Accepted by GetIntegerv. */
public static final int GL_TESSELLATION_MODE_AMD = 0x9004;
/** Accepted by GetFloatv. */
public static final int GL_TESSELLATION_FACTOR_AMD = 0x9005;
static { GL.initialize(); }
protected AMDVertexShaderTessellator() {
throw new UnsupportedOperationException();
}
static boolean isAvailable(GLCapabilities caps) {
return checkFunctions(
caps.glTessellationFactorAMD, caps.glTessellationModeAMD
);
}
// --- [ glTessellationFactorAMD ] ---
public static native void glTessellationFactorAMD(@NativeType("GLfloat") float factor);
// --- [ glTessellationModeAMD ] ---
public static native void glTessellationModeAMD(@NativeType("GLenum") int mode);
}