mirror of
https://github.com/DrBeef/Raze.git
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85 lines
1.8 KiB
C++
85 lines
1.8 KiB
C++
#include "glbackend.h"
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#include "glad/glad.h"
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#include "gl_samplers.h"
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GLInstance GLInterface;
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void GLInstance::Init()
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{
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mSamplers = new FSamplerManager;
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memset(LastBoundTextures, 0, sizeof(LastBoundTextures));
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}
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void GLInstance::Deinit()
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{
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if (mSamplers) delete mSamplers;
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}
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std::pair<size_t, BaseVertex *> GLInstance::AllocVertices(size_t num)
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{
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Buffer.resize(num);
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return std::make_pair((size_t)0, Buffer.data());
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}
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static GLint primtypes[] =
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{
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GL_TRIANGLES,
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GL_TRIANGLE_STRIP,
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GL_TRIANGLE_FAN,
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GL_QUADS,
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GL_LINES
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};
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void GLInstance::Draw(EDrawType type, size_t start, size_t count)
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{
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glBegin(primtypes[type]);
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auto p = &Buffer[start];
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for (size_t i = 0; i < count; i++, p++)
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{
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glTexCoord2f(p->u, p->v);
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glVertex3f(p->x, p->y, p->z);
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}
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glEnd();
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}
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int GLInstance::GetTextureID()
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{
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// Generating large numbers of texture IDs piece by piece does not work well on modern NVidia drivers.
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if (currentindex == THCACHESIZE)
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{
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currentindex = 0;
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glGenTextures(THCACHESIZE, TextureHandleCache);
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}
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else currentindex++;
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return TextureHandleCache[currentindex];
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}
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void GLInstance::BindTexture(int texunit, int tex, int sampler)
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{
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if (texunit != 0) glActiveTexture(GL_TEXTURE0 + texunit);
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glBindTexture(GL_TEXTURE_2D, tex);
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if (sampler != NoSampler) mSamplers->Bind(texunit, sampler, 0);
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else glBindSampler(texunit, 0);
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if (texunit != 0) glActiveTexture(GL_TEXTURE0);
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LastBoundTextures[texunit] = tex;
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}
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void GLInstance::UnbindTexture(int texunit)
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{
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if (LastBoundTextures[texunit] != 0)
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{
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if (texunit != 0) glActiveTexture(GL_TEXTURE0+texunit);
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glBindTexture(GL_TEXTURE_2D, 0);
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if (texunit != 0) glActiveTexture(GL_TEXTURE0);
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LastBoundTextures[texunit] = 0;
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}
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}
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void GLInstance::UnbindAllTextures()
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{
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for(int texunit = 0; texunit < MAX_TEXTURES; texunit++)
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{
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UnbindTexture(texunit);
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}
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}
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