75 lines
2.7 KiB
Plaintext
75 lines
2.7 KiB
Plaintext
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static void computeLightSpace(glm::mat4 view, glm::mat4 proj,
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glm::vec3 lightDir,
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glm::mat4 out[3]){
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glm::mat4 inv = glm::inverse(proj*view);
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glm::vec4 corners[8] = {
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{-1,-1,-1,1},{1,-1,-1,1},{1,1,-1,1},{-1,1,-1,1},
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{-1,-1, 1,1},{1,-1, 1,1},{1,1, 1,1},{-1,1, 1,1}
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};
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for(int i=0;i<3;i++){
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glm::mat4 lightView = glm::lookAt(-lightDir*100.0f,glm::vec3(0),glm::vec3(0,1,0));
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glm::vec3 mn(FLT_MAX), mx(-FLT_MAX);
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for(auto &c: corners){
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glm::vec4 wc = inv * c; wc/=wc.w;
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glm::vec4 lc = lightView * wc;
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mn = glm::min(mn,glm::vec3(lc));
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mx = glm::max(mx,glm::vec3(lc));
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}
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out[i] = glm::ortho(mn.x,mx.x,mn.y,mx.y,-mx.z-50.0f,-mn.z+50.0f) * lightView;
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}
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}
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void VoxelGame::render(glm::mat4 const& view, glm::mat4 const& proj){
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computeLightSpace(view,proj,lightDir,lightSpaceMat);
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// 1) depth passes
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for(int i=0;i<NUM_CASCADES;i++){
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glViewport(0,0,SHADOW_MAP_SIZE,SHADOW_MAP_SIZE);
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glBindFramebuffer(GL_FRAMEBUFFER,depthFBO[i]);
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glClear(GL_DEPTH_BUFFER_BIT);
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glUseProgram(depthProg);
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glUniformMatrix4fv(glGetUniformLocation(depthProg,"uLightSpace"),
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1,GL_FALSE,glm::value_ptr(lightSpaceMat[i]));
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renderScene(depthProg);
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}
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glBindFramebuffer(GL_FRAMEBUFFER,0);
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// 2) main pass
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glViewport(0,0,screenW,screenH);
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glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
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glUseProgram(mainProg);
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glUniformMatrix4fv(glGetUniformLocation(mainProg,"uView"),
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1,GL_FALSE,glm::value_ptr(view));
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glUniformMatrix4fv(glGetUniformLocation(mainProg,"uProj"),
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1,GL_FALSE,glm::value_ptr(proj));
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for(int i=0;i<NUM_CASCADES;i++){
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char buf[32]; sprintf(buf,"uLightSpace[%d]",i);
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glUniformMatrix4fv(glGetUniformLocation(mainProg,buf),
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1,GL_FALSE,glm::value_ptr(lightSpaceMat[i]));
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}
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glUniform1fv(glGetUniformLocation(mainProg,"cascadeSplit"),
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NUM_CASCADES,cascadeSplits);
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glUniform3fv(glGetUniformLocation(mainProg,"lightDir"),
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1,glm::value_ptr(lightDir));
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glUniform3fv(glGetUniformLocation(mainProg,"viewPos"),
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1,glm::value_ptr(cameraPos));
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// bind textures
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D,textureDirt);
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glUniform1i(glGetUniformLocation(mainProg,"uTexDirt"),0);
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glActiveTexture(GL_TEXTURE1);
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glBindTexture(GL_TEXTURE_2D,textureGrass);
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glUniform1i(glGetUniformLocation(mainProg,"uTexGrass"),1);
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for(int i=0;i<NUM_CASCADES;i++){
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glActiveTexture(GL_TEXTURE2+i);
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glBindTexture(GL_TEXTURE_2D,depthTex[i]);
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char buf[32]; sprintf(buf,"uShadowMap[%d]",i);
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glUniform1i(glGetUniformLocation(mainProg,buf),2+i);
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}
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renderScene(mainProg);
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}
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