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Use a buffer for quads indices

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also use glDrawRangeElements for quad drawing
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Vitaliy 2023-04-08 20:08:03 +03:00 committed by GitHub
parent e01f285c8f
commit aa1696a7e6
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2 changed files with 15 additions and 6 deletions
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16
source/Irrlicht/OpenGL/Driver.cpp
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@ -186,6 +186,7 @@ COpenGL3DriverBase::~COpenGL3DriverBase()
void COpenGL3DriverBase::initQuadsIndices(int max_vertex_count)
{
int max_quad_count = max_vertex_count / 4;
std::vector<GLushort> QuadsIndices;
QuadsIndices.reserve(6 * max_quad_count);
for (int k = 0; k < max_quad_count; k++) {
QuadsIndices.push_back(4 * k + 0);
@ -195,6 +196,11 @@ COpenGL3DriverBase::~COpenGL3DriverBase()
QuadsIndices.push_back(4 * k + 2);
QuadsIndices.push_back(4 * k + 3);
}
glGenBuffers(1, &QuadIndexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, QuadIndexBuffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(QuadsIndices[0]) * QuadsIndices.size(), QuadsIndices.data(), GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
QuadIndexCount = QuadsIndices.size();
}
bool COpenGL3DriverBase::genericDriverInit(const core::dimension2d<u32>& screenSize, bool stencilBuffer)
@ -919,7 +925,7 @@ COpenGL3DriverBase::~COpenGL3DriverBase()
}
const irr::u32 drawCount = core::min_<u32>(positions.size(), sourceRects.size());
assert(6 * std::size_t(drawCount) <= QuadsIndices.size());
assert(6 * drawCount <= QuadIndexCount); // FIXME split the batch? or let it crash?
core::array<S3DVertex> vtx(drawCount * 4);
@ -959,7 +965,9 @@ COpenGL3DriverBase::~COpenGL3DriverBase()
tcoords.UpperLeftCorner.X, tcoords.LowerRightCorner.Y));
}
drawElements(GL_TRIANGLES, vt2DImage, vtx.const_pointer(), QuadsIndices.data(), 6 * drawCount);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, QuadIndexBuffer);
drawElements(GL_TRIANGLES, vt2DImage, vtx.const_pointer(), vtx.size(), 0, 6 * drawCount);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
if (clipRect)
glDisable(GL_SCISSOR_TEST);
@ -1102,10 +1110,10 @@ COpenGL3DriverBase::~COpenGL3DriverBase()
endDraw(vertexType);
}
void COpenGL3DriverBase::drawElements(GLenum primitiveType, const VertexType &vertexType, const void *vertices, const u16 *indices, int indexCount)
void COpenGL3DriverBase::drawElements(GLenum primitiveType, const VertexType &vertexType, const void *vertices, int vertexCount, const u16 *indices, int indexCount)
{
beginDraw(vertexType, reinterpret_cast<uintptr_t>(vertices));
glDrawElements(primitiveType, indexCount, GL_UNSIGNED_SHORT, indices);
glDrawRangeElements(primitiveType, 0, vertexCount - 1, indexCount, GL_UNSIGNED_SHORT, indices);
endDraw(vertexType);
}

5
source/Irrlicht/OpenGL/Driver.h
View File

@ -331,7 +331,7 @@ namespace video
void drawQuad(const VertexType &vertexType, const S3DVertex (&vertices)[4]);
void drawArrays(GLenum primitiveType, const VertexType &vertexType, const void *vertices, int vertexCount);
void drawElements(GLenum primitiveType, const VertexType &vertexType, const void *vertices, const u16 *indices, int indexCount);
void drawElements(GLenum primitiveType, const VertexType &vertexType, const void *vertices, int vertexCount, const u16 *indices, int indexCount);
void drawElements(GLenum primitiveType, const VertexType &vertexType, uintptr_t vertices, uintptr_t indices, int indexCount);
void beginDraw(const VertexType &vertexType, uintptr_t verticesBase);
@ -386,7 +386,8 @@ private:
void addDummyMaterial(E_MATERIAL_TYPE type);
std::vector<u16> QuadsIndices;
unsigned QuadIndexCount;
GLuint QuadIndexBuffer = 0;
void initQuadsIndices(int max_vertex_count = 65536);
void debugCb(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar *message);