mirror of
https://github.com/melonDS-emu/melonDS.git
synced 2025-07-21 05:09:46 -06:00
get the OpenGL renderer going.
sorta. (also make the blackmagic_II branch obsolete in the process)
This commit is contained in:
Arisotura
207
src/GPU_OpenGL.cpp
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207
src/GPU_OpenGL.cpp
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/*
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Copyright 2016-2020 Arisotura
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This file is part of melonDS.
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melonDS is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with melonDS. If not, see http://www.gnu.org/licenses/.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "NDS.h"
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#include "GPU.h"
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#include "Config.h"
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#include "OpenGLSupport.h"
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#include "GPU_OpenGL_shaders.h"
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namespace GPU
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{
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namespace GLCompositor
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{
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using namespace OpenGL;
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int Scale;
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int ScreenH, ScreenW;
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GLuint CompShader[1][3];
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GLuint CompScaleLoc[1];
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GLuint CompVertexBufferID;
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GLuint CompVertexArrayID;
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float CompVertices[2 * 3*2 * 2]; // position
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GLuint CompScreenInputTex;
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GLuint CompScreenOutputTex;
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GLuint CompScreenOutputFB;
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bool Init()
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{
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if (!OpenGL::BuildShaderProgram(kCompositorVS, kCompositorFS_Nearest, CompShader[0], "CompositorShader"))
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//if (!OpenGL::BuildShaderProgram(kCompositorVS, kCompositorFS_Linear, CompShader[0], "CompositorShader"))
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//if (!OpenGL::BuildShaderProgram(kCompositorVS_xBRZ, kCompositorFS_xBRZ, CompShader[0], "CompositorShader"))
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return false;
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for (int i = 0; i < 1; i++)
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{
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GLint uni_id;
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glBindAttribLocation(CompShader[i][2], 0, "vPosition");
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glBindFragDataLocation(CompShader[i][2], 0, "oColor");
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if (!OpenGL::LinkShaderProgram(CompShader[i]))
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return false;
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CompScaleLoc[i] = glGetUniformLocation(CompShader[i][2], "u3DScale");
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glUseProgram(CompShader[i][2]);
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uni_id = glGetUniformLocation(CompShader[i][2], "ScreenTex");
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glUniform1i(uni_id, 0);
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uni_id = glGetUniformLocation(CompShader[i][2], "_3DTex");
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glUniform1i(uni_id, 1);
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}
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#define SETVERTEX(i, x, y) \
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CompVertices[2*(i) + 0] = x; \
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CompVertices[2*(i) + 1] = y;
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// top screen
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SETVERTEX(0, -1, 1);
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SETVERTEX(1, 1, 0);
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SETVERTEX(2, 1, 1);
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SETVERTEX(3, -1, 1);
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SETVERTEX(4, -1, 0);
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SETVERTEX(5, 1, 0);
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// bottom screen
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SETVERTEX(6, -1, 0);
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SETVERTEX(7, 1, -1);
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SETVERTEX(8, 1, 0);
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SETVERTEX(9, -1, 0);
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SETVERTEX(10, -1, -1);
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SETVERTEX(11, 1, -1);
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#undef SETVERTEX
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glGenBuffers(1, &CompVertexBufferID);
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glBindBuffer(GL_ARRAY_BUFFER, CompVertexBufferID);
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glBufferData(GL_ARRAY_BUFFER, sizeof(CompVertices), CompVertices, GL_STATIC_DRAW);
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glGenVertexArrays(1, &CompVertexArrayID);
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glBindVertexArray(CompVertexArrayID);
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glEnableVertexAttribArray(0); // position
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glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2*4, (void*)(0));
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glGenFramebuffers(1, &CompScreenOutputFB);
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glGenTextures(1, &CompScreenInputTex);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, CompScreenInputTex);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8UI, 256*3 + 1, 192*2, 0, GL_RGBA_INTEGER, GL_UNSIGNED_BYTE, NULL);
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glGenTextures(1, &CompScreenOutputTex);
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glBindTexture(GL_TEXTURE_2D, CompScreenOutputTex);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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return true;
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}
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void DeInit()
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{
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glDeleteFramebuffers(1, &CompScreenOutputFB);
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glDeleteTextures(1, &CompScreenInputTex);
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glDeleteTextures(1, &CompScreenOutputTex);
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glDeleteVertexArrays(1, &CompVertexArrayID);
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glDeleteBuffers(1, &CompVertexBufferID);
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for (int i = 0; i < 1; i++)
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OpenGL::DeleteShaderProgram(CompShader[i]);
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}
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void Reset()
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{
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}
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void UpdateDisplaySettings()
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{
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int scale = Config::GL_ScaleFactor;
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Scale = scale;
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ScreenW = 256 * scale;
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ScreenH = 384 * scale;
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glBindTexture(GL_TEXTURE_2D, CompScreenOutputTex);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, ScreenW, ScreenH, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
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GLenum fbassign[] = {GL_COLOR_ATTACHMENT0};
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glBindFramebuffer(GL_FRAMEBUFFER, CompScreenOutputFB);
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glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, CompScreenOutputTex, 0);
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glDrawBuffers(1, fbassign);
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}
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void RenderFrame()
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{
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glBindFramebuffer(GL_FRAMEBUFFER, CompScreenOutputFB);
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glDisable(GL_DEPTH_TEST);
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glDisable(GL_STENCIL_TEST);
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glDisable(GL_BLEND);
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glColorMaski(0, GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
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glViewport(0, 0, ScreenW, ScreenH);
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// TODO: select more shaders (filtering, etc)
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OpenGL::UseShaderProgram(CompShader[0]);
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glUniform1ui(CompScaleLoc[0], Scale);
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//if (RunningSomething)
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{
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int frontbuf = GPU::FrontBuffer;
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, CompScreenInputTex);
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if (GPU::Framebuffer[frontbuf][0] && GPU::Framebuffer[frontbuf][1])
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{
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 256*3 + 1, 192, GL_RGBA_INTEGER,
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GL_UNSIGNED_BYTE, GPU::Framebuffer[frontbuf][0]);
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 192, 256*3 + 1, 192, GL_RGBA_INTEGER,
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GL_UNSIGNED_BYTE, GPU::Framebuffer[frontbuf][1]);
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}
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glActiveTexture(GL_TEXTURE1);
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GPU3D::GLRenderer::SetupAccelFrame();
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glBindBuffer(GL_ARRAY_BUFFER, CompVertexBufferID);
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glBindVertexArray(CompVertexArrayID);
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glDrawArrays(GL_TRIANGLES, 0, 4*3);
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}
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}
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void BindOutputTexture()
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{
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glBindTexture(GL_TEXTURE_2D, CompScreenOutputTex);
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}
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}
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}
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