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When OpenGL is available, prefer using the new glsurface to blit the classic renderer's 8-bit buffer to the screen.
git-svn-id: https://svn.eduke32.com/eduke32@6919 1a8010ca-5511-0410-912e-c29ae57300e0
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6 changed files with 334 additions and 11 deletions
238
source/build/src/glsurface.cpp
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238
source/build/src/glsurface.cpp
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/*
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* glsurface.cpp
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* A 32-bit rendering surface that can quickly blit 8-bit paletted buffers implemented in OpenGL.
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*
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* Copyright © 2018, Alex Dawson. All rights reserved.
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*/
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#include "glsurface.h"
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#include "glad/glad.h"
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#include "baselayer.h"
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#include "build.h"
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static void* buffer;
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static GLuint bufferTexID;
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static vec2_t bufferRes;
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static GLuint paletteTexIDs[MAXBASEPALS];
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static GLuint quadVertsID = 0;
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static GLuint shaderProgramID = 0;
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static GLint texSamplerLoc = -1;
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static GLint paletteSamplerLoc = -1;
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static GLuint compileShader(GLenum shaderType, const char* const source)
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{
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GLuint shaderID = glCreateShader(shaderType);
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if (shaderID == 0)
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return 0;
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const char* const sources[1] = {source};
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glShaderSource(shaderID,
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1,
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sources,
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NULL);
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glCompileShader(shaderID);
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GLint compileStatus;
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glGetShaderiv(shaderID, GL_COMPILE_STATUS, &compileStatus);
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OSD_Printf("Compile Status: %u\n", compileStatus);
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if (!compileStatus)
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{
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GLint logLength;
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glGetShaderiv(shaderID, GL_INFO_LOG_LENGTH, &logLength);
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if (logLength > 0)
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{
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char *infoLog = (char*) malloc(logLength);
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glGetShaderInfoLog(shaderID, logLength, &logLength, infoLog);
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OSD_Printf("Log:\n%s\n", infoLog);
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free(infoLog);
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}
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}
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return shaderID;
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}
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bool glsurface_initialize(vec2_t inputBufferResolution)
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{
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if (buffer)
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glsurface_destroy();
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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bufferRes = inputBufferResolution;
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buffer = malloc(bufferRes.x*bufferRes.y);
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glGenBuffers(1, &quadVertsID);
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glBindBuffer(GL_ARRAY_BUFFER, quadVertsID);
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const float quadVerts[] =
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{
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-1.0f, 1.0f, 0.0f, 0.0f, 0.0f, //top-left
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-1.0f, -1.0f, 0.0f, 0.0f, 1.0f, //bottom-left
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1.0f, 1.0f, 0.0f, 1.0f, 0.0f, //top-right
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1.0f, -1.0f, 0.0f, 1.0f, 1.0f //bottom-right
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};
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glBufferData(GL_ARRAY_BUFFER, sizeof(quadVerts), quadVerts, GL_STATIC_DRAW);
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//specify format/arrangement for vertex positions:
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glVertexAttribPointer(0, 3, GL_FLOAT, false, sizeof(float) * 5, 0);
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//specify format/arrangement for vertex texture coords:
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glVertexAttribPointer(1, 2, GL_FLOAT, false, sizeof(float) * 5, (const void*) (sizeof(float) * 3));
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glEnableVertexAttribArray(0);
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glEnableVertexAttribArray(1);
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glGenTextures(1, &bufferTexID);
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glBindTexture(GL_TEXTURE_2D, bufferTexID);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 1);
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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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glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, bufferRes.x, bufferRes.y, 0, GL_RED, GL_UNSIGNED_BYTE, 0);
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const char* const VERTEX_SHADER_CODE =
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"#version 110\n\
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\n\
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attribute vec4 i_vertPos;\n\
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attribute vec2 i_texCoord;\n\
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\n\
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varying vec2 v_texCoord;\n\
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\n\
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void main()\n\
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{\n\
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gl_Position = i_vertPos;\n\
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v_texCoord = i_texCoord;\n\
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}\n";
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const char* const FRAGMENT_SHADER_CODE =
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"#version 110\n\
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\n\
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//s_texture points to an indexed color texture\n\
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uniform sampler2D s_texture;\n\
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//s_palette is the palette texture\n\
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uniform sampler2D s_palette;\n\
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\n\
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varying vec2 v_texCoord;\n\
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\n\
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const float c_paletteScale = 255.0/256.0;\n\
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const float c_paletteOffset = 0.5/256.0;\n\
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\n\
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void main()\n\
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{\n\
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vec4 color = texture2D(s_texture, v_texCoord.xy);\n\
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color.r = c_paletteOffset + c_paletteScale*color.r;\n\
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color = texture2D(s_palette, color.rg);\n\
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\n\
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// DEBUG \n\
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//color = texture2D(s_palette, v_texCoord.xy);\n\
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//color = texture2D(s_texture, v_texCoord.xy);\n\
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\n\
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gl_FragColor = color;\n\
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}\n";
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shaderProgramID = glCreateProgram();
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GLuint vertexShaderID = compileShader(GL_VERTEX_SHADER, VERTEX_SHADER_CODE);
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GLuint fragmentShaderID = compileShader(GL_FRAGMENT_SHADER, FRAGMENT_SHADER_CODE);
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glAttachShader(shaderProgramID, vertexShaderID);
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glAttachShader(shaderProgramID, fragmentShaderID);
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glBindAttribLocation(shaderProgramID, 0, "i_vertPos");
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glBindAttribLocation(shaderProgramID, 1, "i_texCoord");
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glLinkProgram(shaderProgramID);
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glDetachShader(shaderProgramID, vertexShaderID);
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glDeleteShader(vertexShaderID);
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glDetachShader(shaderProgramID, fragmentShaderID);
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glDeleteShader(fragmentShaderID);
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glUseProgram(shaderProgramID);
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texSamplerLoc = glGetUniformLocation(shaderProgramID, "s_texture");
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paletteSamplerLoc = glGetUniformLocation(shaderProgramID, "s_palette");
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glUniform1i(texSamplerLoc, 0);
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glUniform1i(paletteSamplerLoc, 1);
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for (int basepalnum = 0; basepalnum < MAXBASEPALS; ++basepalnum)
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{
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glsurface_setPalette(basepalnum, basepaltable[basepalnum]);
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}
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return true;
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}
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void glsurface_destroy()
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{
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if (!buffer)
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return;
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free(buffer);
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buffer = 0;
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glDeleteBuffers(1, &quadVertsID);
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quadVertsID = 0;
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glDeleteTextures(1, &bufferTexID);
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bufferTexID = 0;
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glDeleteTextures(MAXBASEPALS, paletteTexIDs);
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memset(paletteTexIDs, 0, sizeof(paletteTexIDs));
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glDeleteProgram(shaderProgramID);
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shaderProgramID = 0;
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}
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void glsurface_setPalette(int32_t paletteID, void* pPalette)
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{
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if (!buffer)
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return;
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if (!pPalette)
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return;
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glActiveTexture(GL_TEXTURE1);
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if (paletteTexIDs[paletteID])
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{
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glBindTexture(GL_TEXTURE_2D, paletteTexIDs[paletteID]);
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 256, 1, GL_RGB, GL_UNSIGNED_BYTE, (void*) buffer);
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}
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else
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{
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glGenTextures(1, paletteTexIDs+paletteID);
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glBindTexture(GL_TEXTURE_2D, paletteTexIDs[paletteID]);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 1);
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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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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, 256, 1, 0, GL_RGB, GL_UNSIGNED_BYTE, pPalette);
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}
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}
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void* glsurface_getBuffer()
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{
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return buffer;
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}
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vec2_t glsurface_getBufferResolution()
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{
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return bufferRes;
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}
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void glsurface_blitBuffer(int32_t paletteID)
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{
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if (!buffer)
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return;
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glActiveTexture(GL_TEXTURE1);
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glBindTexture(GL_TEXTURE_2D, paletteTexIDs[paletteID]);
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glActiveTexture(GL_TEXTURE0);
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, bufferRes.x, bufferRes.y, GL_RED, GL_UNSIGNED_BYTE, (void*) buffer);
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glDrawArrays(GL_TRIANGLE_STRIP,
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0,
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4);
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}
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