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Running
on
Zero
File size: 5,280 Bytes
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/*
* Copyright (C) 2023, Inria
* GRAPHDECO research group, https://team.inria.fr/graphdeco
* All rights reserved.
*
* This software is free for non-commercial, research and evaluation use
* under the terms of the LICENSE.md file.
*
* For inquiries contact sibr@inria.fr and/or George.Drettakis@inria.fr
*/
#include "core/graphics/Texture.hpp"
#include "GaussianSurfaceRenderer.hpp"
namespace sibr {
GaussianData::GaussianData(int num_gaussians, float* mean_data, float* rot_data, float* scale_data, float* alpha_data, float* color_data)
{
_num_gaussians = num_gaussians;
glCreateBuffers(1, &meanBuffer);
glCreateBuffers(1, &rotBuffer);
glCreateBuffers(1, &scaleBuffer);
glCreateBuffers(1, &alphaBuffer);
glCreateBuffers(1, &colorBuffer);
glNamedBufferStorage(meanBuffer, num_gaussians * 3 * sizeof(float), mean_data, 0);
glNamedBufferStorage(rotBuffer, num_gaussians * 4 * sizeof(float), rot_data, 0);
glNamedBufferStorage(scaleBuffer, num_gaussians * 3 * sizeof(float), scale_data, 0);
glNamedBufferStorage(alphaBuffer, num_gaussians * sizeof(float), alpha_data, 0);
glNamedBufferStorage(colorBuffer, num_gaussians * sizeof(float) * 48, color_data, 0);
}
void GaussianData::render(int G) const
{
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, meanBuffer);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, rotBuffer);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, scaleBuffer);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 3, alphaBuffer);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 4, colorBuffer);
glDrawArraysInstanced(GL_TRIANGLES, 0, 36, G);
}
GaussianSurfaceRenderer::GaussianSurfaceRenderer( void )
{
_shader.init("GaussianSurface",
sibr::loadFile(sibr::getShadersDirectory("gaussian") + "/gaussian_surface.vert"),
sibr::loadFile(sibr::getShadersDirectory("gaussian") + "/gaussian_surface.frag"));
_paramCamPos.init(_shader, "rayOrigin");
_paramMVP.init(_shader,"MVP");
_paramLimit.init(_shader, "alpha_limit");
_paramStage.init(_shader, "stage");
glCreateTextures(GL_TEXTURE_2D, 1, &idTexture);
glTextureParameteri(idTexture, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTextureParameteri(idTexture, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glCreateTextures(GL_TEXTURE_2D, 1, &colorTexture);
glTextureParameteri(colorTexture, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTextureParameteri(colorTexture, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glCreateFramebuffers(1, &fbo);
glCreateRenderbuffers(1, &depthBuffer);
makeFBO(800, 800);
clearProg = glCreateProgram();
const char* clearShaderSrc = R"(
#version 430
layout(local_size_x = 256, local_size_y = 1, local_size_z = 1) in;
layout(std430, binding = 0) buffer IntArray {
int arr[];
};
layout(location = 0) uniform int size;
void main() {
uint index = gl_GlobalInvocationID.x;
if (index < size) {
arr[index] = 0;
}
}
)";
clearShader = glCreateShader(GL_COMPUTE_SHADER);
glShaderSource(clearShader, 1, &clearShaderSrc, nullptr);
glAttachShader(clearProg, clearShader);
glLinkProgram(clearProg);
}
void GaussianSurfaceRenderer::makeFBO(int w, int h)
{
resX = w;
resY = h;
glBindTexture(GL_TEXTURE_2D, idTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_R32UI, resX, resY, 0, GL_RED_INTEGER, GL_UNSIGNED_INT, 0);
glBindTexture(GL_TEXTURE_2D, colorTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, resX, resY, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glBindTexture(GL_TEXTURE_2D, 0);
glNamedRenderbufferStorage(depthBuffer, GL_DEPTH_COMPONENT, resX, resY);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, colorTexture, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, idTexture, 0);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthBuffer);
}
int GaussianSurfaceRenderer::process(int G, const GaussianData& mesh, const Camera& eye, IRenderTarget& target, float limit, sibr::Mesh::RenderMode mode, bool backFaceCulling)
{
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
if (target.w() != resX || target.h() != resY)
{
makeFBO(target.w(), target.h());
}
// Solid pass
GLuint drawBuffers[2];
drawBuffers[0] = GL_COLOR_ATTACHMENT0;
drawBuffers[1] = GL_COLOR_ATTACHMENT1;
glDrawBuffers(2, drawBuffers);
glEnable(GL_DEPTH_TEST);
glDisable(GL_BLEND);
_shader.begin();
_paramMVP.set(eye.viewproj());
_paramCamPos.set(eye.position());
_paramLimit.set(limit);
_paramStage.set(0);
mesh.render(G);
// Simple additive blendnig (no order)
glDrawBuffers(1, drawBuffers);
glDepthMask(GL_FALSE);
glEnable(GL_BLEND);
glBlendEquation(GL_FUNC_ADD);
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
_paramStage.set(1);
mesh.render(G);
glDepthMask(GL_TRUE);
glDisable(GL_BLEND);
_shader.end();
glReadBuffer(GL_COLOR_ATTACHMENT0);
glBlitNamedFramebuffer(
fbo, target.fbo(),
0, 0, resX, resY,
0, 0, resX, resY,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
return 0;
}
} /*namespace sibr*/
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