Rewritten particle rendering, now uses its own vertex type for optimization

src/graphics/core/renderers.h

@@ -24,8 +24,6 @@
 
 #pragma once
 
-#include "graphics/core/vertex.h"
-
 #include <glm/glm.hpp>
 
 // Graphics module namespace
@@ -35,7 +33,11 @@ namespace Gfx
 class CVertexBuffer;
 enum class CullFace : unsigned char;
 enum class TransparencyMode : unsigned char;
+struct Color;
 struct Texture;
+struct Vertex2D;
+struct Vertex3D;
+struct VertexParticle;
 
 /**
  * \enum PrimitiveType
@@ -250,7 +252,7 @@ public:
     virtual void SetTransparency(TransparencyMode mode) = 0;
 
     //! Draws particles
-    virtual void DrawParticle(PrimitiveType type, int count, const Vertex3D* vertices) = 0;
+    virtual void DrawParticle(PrimitiveType type, int count, const VertexParticle* vertices) = 0;
 };
 
 /**

src/graphics/core/vertex.h

@@ -61,4 +61,15 @@ struct Vertex3D
     glm::vec3 normal = { 0.0f, 0.0f, 1.0f };
 };
 
+/**
+ * \struct VertexParticle
+ * \brief 3D vertex for particle rendering, contains color and UV coordinates
+ */
+struct VertexParticle
+{
+    glm::vec3 position = { 0.0f, 0.0f, 0.0f };
+    glm::u8vec4 color = { 255, 255, 255, 255 };
+    glm::vec2 uv = { 0.0f, 0.0f };
+};
+
 } // namespace Gfx

src/graphics/engine/lightning.cpp

@@ -244,7 +244,7 @@ void CLightning::Draw()
     glm::vec3 n = glm::normalize(p1-eye);
 
     glm::vec3 corner[4];
-    Vertex3D vertex[4];
+    VertexParticle vertex[4];
 
     for (std::size_t i = 0; i < m_segments.size() - 1; i++)
     {

src/graphics/engine/particle.cpp

@@ -2604,7 +2604,7 @@ void CParticle::TrackDraw(int i, ParticleType type)
     glm::vec3 eye = m_engine->GetEyePt();
     float a = Math::RotateAngle(eye.x-p1.x, eye.z-p1.z);
 
-    Vertex3D vertex[4];
+    VertexParticle vertex[4];
     glm::vec3 corner[4];
 
     for (int counter = 0; counter < m_track[i].posUsed-1; counter++)
@@ -2692,7 +2692,16 @@ void CParticle::DrawParticleTriangle(int i)
     mat[3][2] = pos.z;
     m_renderer->SetModelMatrix(mat);
 
-    m_renderer->DrawParticle(PrimitiveType::TRIANGLES, 3, m_triangle[i].triangle);
+    VertexParticle vertices[3];
+
+    for (size_t j = 0; j < 3; j++)
+    {
+        vertices[j].position = m_triangle[i].triangle[j].position;
+        vertices[j].color = m_triangle[i].triangle[j].color;
+        vertices[j].uv = m_triangle[i].triangle[j].uv;
+    }
+
+    m_renderer->DrawParticle(PrimitiveType::TRIANGLES, 3, vertices);
     m_engine->AddStatisticTriangle(1);
 }
 
@@ -2705,7 +2714,7 @@ void CParticle::DrawParticleNorm(int i)
 
 
     glm::vec3 corner[4];
-    Vertex3D vertex[4];
+    VertexParticle vertex[4];
 
     if (m_particle[i].sheet == SH_INTERFACE)
     {
@@ -2853,7 +2862,7 @@ void CParticle::DrawParticleFlat(int i)
 
     glm::u8vec4 white(255);
 
-    Vertex3D vertex[4];
+    VertexParticle vertex[4];
     vertex[0] = { corner[1], white, { m_particle[i].texSup.x, m_particle[i].texSup.y } };
     vertex[1] = { corner[0], white, { m_particle[i].texInf.x, m_particle[i].texSup.y } };
     vertex[2] = { corner[3], white, { m_particle[i].texSup.x, m_particle[i].texInf.y } };
@@ -2939,7 +2948,7 @@ void CParticle::DrawParticleFog(int i)
 
     glm::u8vec4 white(255);
 
-    Vertex3D vertex[4];
+    VertexParticle vertex[4];
 
     vertex[0] = { corner[1], white, { m_particle[i].texSup.x, m_particle[i].texSup.y } };
     vertex[1] = { corner[0], white, { m_particle[i].texInf.x, m_particle[i].texSup.y } };
@@ -3067,7 +3076,7 @@ void CParticle::DrawParticleRay(int i)
     corner[2].z = (Math::Rand()-0.5f)*vario1;
     corner[3].z = (Math::Rand()-0.5f)*vario1;
 
-    Vertex3D vertex[4];
+    VertexParticle vertex[4];
 
     glm::u8vec4 white(255);
 
@@ -3164,7 +3173,7 @@ void CParticle::DrawParticleSphere(int i)
     float deltaRingAngle = Math::PI/numRings;
     float deltaSegAngle  = 2.0f*Math::PI/numSegments;
 
-    std::vector<Vertex3D> vertex(2*16*(16+1));
+    std::vector<VertexParticle> vertex(2*16*(16+1));
 
     glm::u8vec4 white(255);
 
@@ -3265,7 +3274,7 @@ void CParticle::DrawParticleCylinder(int i)
         }
     }
 
-    std::vector<Vertex3D> vertex(2*5*(10+1));
+    std::vector<VertexParticle> vertex(2*5*(10+1));
 
     glm::u8vec4 white(255);
 
@@ -3360,7 +3369,7 @@ void CParticle::DrawParticleWheel(int i)
 
         auto color = ColorToIntColor(TraceColorColor(m_wheelTrace[i].color));
 
-        Vertex3D vertex[4];
+        VertexParticle vertex[4];
         vertex[0] = { pos[0], color, { ts.x, ts.y } };
         vertex[1] = { pos[1], color, { ti.x, ts.y } };
         vertex[2] = { pos[2], color, { ts.x, ti.y } };
@@ -3379,7 +3388,7 @@ void CParticle::DrawParticleWheel(int i)
 
         auto color = ColorToIntColor(TraceColorColor(m_wheelTrace[i].color));
 
-        Vertex3D vertex[4];
+        VertexParticle vertex[4];
         vertex[0] = { pos[0], color };
         vertex[1] = { pos[1], color };
         vertex[2] = { pos[2], color };

src/graphics/opengl33/gl33_particle_renderer.cpp

@@ -67,8 +67,6 @@ CGL33ParticleRenderer::CGL33ParticleRenderer(CGL33Device* device)
     glUseProgram(m_program);
 
     // Setup uniforms
-    glm::mat4 identity(1.0f);
-
     m_projectionMatrix = glGetUniformLocation(m_program, "uni_ProjectionMatrix");
     m_viewMatrix = glGetUniformLocation(m_program, "uni_ViewMatrix");
     m_modelMatrix = glGetUniformLocation(m_program, "uni_ModelMatrix");
@@ -102,7 +100,8 @@ CGL33ParticleRenderer::CGL33ParticleRenderer(CGL33Device* device)
     // Generic buffer
     glGenBuffers(1, &m_bufferVBO);
     glBindBuffer(GL_COPY_WRITE_BUFFER, m_bufferVBO);
-    glBufferData(GL_COPY_WRITE_BUFFER, m_bufferCapacity, nullptr, GL_STREAM_DRAW);
+    glBufferData(GL_COPY_WRITE_BUFFER, m_bufferCapacity * sizeof(VertexParticle), nullptr, GL_STREAM_DRAW);
+    m_bufferOffset = m_bufferCapacity;
 
     glGenVertexArrays(1, &m_bufferVAO);
     glBindVertexArray(m_bufferVAO);
@@ -194,26 +193,52 @@ void CGL33ParticleRenderer::SetTransparency(TransparencyMode mode)
     m_device->SetTransparency(mode);
 }
 
-void CGL33ParticleRenderer::DrawParticle(PrimitiveType type, int count, const Vertex3D* vertices)
+void CGL33ParticleRenderer::DrawParticle(PrimitiveType type, int count, const VertexParticle* vertices)
 {
-    size_t size = count * sizeof(Vertex3D);
+    GLuint total = m_bufferOffset + count;
 
-    if (m_bufferCapacity < size)
-        m_bufferCapacity = size;
+    // Buffer full, orphan
+    if (total >= m_bufferCapacity)
+    {
+        glBufferData(GL_ARRAY_BUFFER, m_bufferCapacity * sizeof(VertexParticle), nullptr, GL_STREAM_DRAW);
 
-    // Send new vertices to GPU
-    glBindBuffer(GL_ARRAY_BUFFER, m_bufferVBO);
-    glBufferData(GL_ARRAY_BUFFER, m_bufferCapacity, nullptr, GL_STREAM_DRAW);
-    glBufferSubData(GL_ARRAY_BUFFER, 0, size, vertices);
+        m_bufferOffset = 0;
 
-    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex3D),
-        reinterpret_cast<void*>(offsetof(Vertex3D, position)));
+        // Respecify vertex attributes
+        glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(VertexParticle),
+            reinterpret_cast<void*>(offsetof(VertexParticle, position)));
 
-    glVertexAttribPointer(1, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(Vertex3D),
-        reinterpret_cast<void*>(offsetof(Vertex3D, color)));
+        glVertexAttribPointer(1, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(VertexParticle),
+            reinterpret_cast<void*>(offsetof(VertexParticle, color)));
 
-    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex3D),
-        reinterpret_cast<void*>(offsetof(Vertex3D, uv)));
+        glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(VertexParticle),
+            reinterpret_cast<void*>(offsetof(VertexParticle, uv)));
+    }
 
-    glDrawArrays(TranslateGfxPrimitive(type), 0, count);
+    void* ptr = glMapBufferRange(GL_ARRAY_BUFFER,
+        m_bufferOffset * sizeof(VertexParticle),
+        count * sizeof(VertexParticle),
+        GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT);
+
+    if (ptr)
+    {
+        auto buffer = reinterpret_cast<VertexParticle*>(ptr);
+
+        std::copy_n(vertices, count, buffer);
+
+        glUnmapBuffer(GL_ARRAY_BUFFER);
+    }
+    else
+    {
+        glBufferSubData(GL_ARRAY_BUFFER,
+            m_bufferOffset * sizeof(VertexParticle),
+            count * sizeof(VertexParticle),
+            vertices);
+    }
+
+    glDrawArrays(TranslateGfxPrimitive(type),
+        m_bufferOffset,
+        count);
+
+    m_bufferOffset += count;
 }

src/graphics/opengl33/gl33_particle_renderer.h

@@ -63,7 +63,7 @@ public:
     virtual void SetTransparency(TransparencyMode mode) override;
 
     //! Draws particles
-    virtual void DrawParticle(PrimitiveType type, int count, const Vertex3D* vertices) override;
+    virtual void DrawParticle(PrimitiveType type, int count, const VertexParticle* vertices) override;
 
 private:
     CGL33Device* const m_device;
@@ -90,7 +90,9 @@ private:
     // Vertex array object
     GLuint m_bufferVAO = 0;
     // VBO capacity
-    GLsizei m_bufferCapacity = 8 * sizeof(Vertex3D);
+    GLsizei m_bufferCapacity = 64 * 1024;
+    // Buffer offset
+    GLsizei m_bufferOffset = 0;
 };
 
 }

src/graphics/opengl33/shaders/gl33/particle_vs.glsl

@@ -27,6 +27,8 @@ uniform mat4 uni_ProjectionMatrix;
 uniform mat4 uni_ViewMatrix;
 uniform mat4 uni_ModelMatrix;
 
+uniform vec4 uni_Color;
+
 out VertexData
 {
     vec4 Color;
@@ -37,6 +39,6 @@ void main()
 {
     gl_Position = uni_ProjectionMatrix * uni_ViewMatrix * uni_ModelMatrix * in_VertexCoord;
 
-    data.Color = in_Color;
+    data.Color = in_Color * uni_Color;
     data.TexCoord = in_TexCoord;
 }