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1. ã·ã§ãŒããŒã³ãŒãïŒGLSLäŸ â æŠå¿µçïŒïŒ
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#version 450 // Or a suitable version for your WebGL extension
// Input from task shader (optional)
in;
// Output to the fragment shader
layout(triangles) out;
layout(max_vertices = 3) out;
void main() {
// Define vertices. This example uses a simple triangle.
gl_MeshVerticesEXT[0].gl_Position = vec4(-0.5, -0.5, 0.0, 1.0);
gl_MeshVerticesEXT[1].gl_Position = vec4(0.5, -0.5, 0.0, 1.0);
gl_MeshVerticesEXT[2].gl_Position = vec4(0.0, 0.5, 0.0, 1.0);
// Emit the primitive (triangle) using the vertex indices
gl_PrimitiveTriangleIndicesEXT[0] = 0;
gl_PrimitiveTriangleIndicesEXT[1] = 1;
gl_PrimitiveTriangleIndicesEXT[2] = 2;
EmitMeshEXT(); // Tell the GPU to output this primitive
}
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2. JavaScriptã»ããã¢ããïŒæŠå¿µçïŒïŒ
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// Assuming WebGL context is already initialized (gl)
// Create and compile the shader programs (similar to traditional shaders)
const meshShader = gl.createShader(gl.MESH_SHADER_EXT); // Assuming extension support
gl.shaderSource(meshShader, meshShaderSource); // Source from above
gl.compileShader(meshShader);
// Check for errors (important!)
if (!gl.getShaderParameter(meshShader, gl.COMPILE_STATUS)) {
console.error("An error occurred compiling the shaders: " + gl.getShaderInfoLog(meshShader));
gl.deleteShader(meshShader);
return;
}
// Create a program and attach the shader
const program = gl.createProgram();
gl.attachShader(program, meshShader);
// Link the program
gl.linkProgram(program);
// Check for errors
if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
console.error('Unable to initialize the shader program: ' + gl.getProgramInfoLog(program));
return;
}
// Use the program
gl.useProgram(program);
// ... Setup buffers, textures, etc.
// Drawing the scene (simplified)
gl.drawMeshTasksEXT(gl.TRIANGLES, 0, 1); // For one Mesh Shader invocation (Conceptual)
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