working on gles 3.1 canvas on windows
This commit is contained in:
parent
c5ae556f22
commit
8e87837fcc
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import os
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from datetime import datetime
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from argparse import ArgumentParser
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parser = ArgumentParser()
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parser.add_argument("inputFiles", nargs="+")
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parser.add_argument("-o", "--output")
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args = parser.parse_args()
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output = open(args.output, "w")
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output.write("/*********************************************************************\n")
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output.write("*\n")
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output.write("*\tfile: %s\n" % os.path.basename(args.output))
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output.write("*\tnote: string literals auto-generated by embed_text.py\n")
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output.write("*\tdate: %s\n" % datetime.now().strftime("%d/%m%Y"))
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output.write("*\n")
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output.write("**********************************************************************/\n")
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outSymbol = (os.path.splitext(os.path.basename(args.output))[0]).upper()
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output.write("#ifndef __%s_H__\n" % outSymbol)
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output.write("#define __%s_H__\n" % outSymbol)
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output.write("\n\n")
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for fileName in args.inputFiles:
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f = open(fileName, "r")
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lines = f.read().splitlines()
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output.write("//NOTE: string imported from %s\n" % fileName)
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stringName = os.path.splitext(os.path.basename(fileName))[0]
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output.write("const char* %s = " % stringName)
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for line in lines:
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output.write("\n\"%s\\n\"" % line)
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output.write(";\n\n")
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f.close()
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output.write("#endif // __%s_H__\n" % outSymbol)
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output.close()
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/************************************************************//**
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*
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* @file: gles_canvas.c
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* @author: Martin Fouilleul
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* @date: 29/01/2023
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* @revision:
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*
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*****************************************************************/
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#include"graphics_internal.h"
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#include"macro_helpers.h"
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#include"gles_canvas_shaders.h"
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#define LOG_SUBSYSTEM "Graphics"
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typedef struct mg_gles_canvas_backend
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{
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mg_canvas_backend interface;
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mg_surface surface;
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GLint dummyVertexBuffer;
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GLint vertexBuffer;
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GLint indexBuffer;
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GLint program;
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char* indexMapping;
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char* vertexMapping;
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} mg_gles_canvas_backend;
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mg_gles_surface* mg_gles_canvas_get_surface(mg_gles_canvas_backend* canvas)
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{
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mg_gles_surface* res = 0;
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mg_surface_data* data = mg_surface_data_from_handle(canvas->surface);
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if(data && data->backend == MG_BACKEND_GLES)
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{
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res = (mg_gles_surface*)data;
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}
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return(res);
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}
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void mg_gles_canvas_draw_buffers(mg_canvas_backend* interface, u32 vertexCount, u32 indexCount, mg_color clearColor)
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{
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mg_gles_canvas_backend* backend = (mg_gles_canvas_backend*)interface;
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mg_gles_surface* surface = mg_gles_canvas_get_surface(backend);
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if(!surface)
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{
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return;
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}
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//WARN: dummy test code
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indexCount = 3;
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*(vec2*)(interface->vertexLayout.posBuffer) = (vec2){400, 300};
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*(vec2*)(interface->vertexLayout.posBuffer + interface->vertexLayout.posStride) = (vec2){450, 300};
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*(vec2*)(interface->vertexLayout.posBuffer + 2*interface->vertexLayout.posStride) = (vec2){400, 350};
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for(int i=0; i<3; i++)
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{
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*(vec4*)(interface->vertexLayout.cubicBuffer + i*interface->vertexLayout.cubicStride) = (vec4){1, 1, 1, 1};
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*(vec2*)(interface->vertexLayout.uvBuffer + i*interface->vertexLayout.uvStride) = (vec2){0, 0};
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*(vec4*)(interface->vertexLayout.colorBuffer + i*interface->vertexLayout.colorStride) = (vec4){1, 0, 0, 1};
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*(vec4*)(interface->vertexLayout.clipBuffer + i*interface->vertexLayout.clipStride) = (vec4){-FLT_MAX/2, -FLT_MAX/2, FLT_MAX, FLT_MAX};
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*(u32*)(interface->vertexLayout.zIndexBuffer + i*interface->vertexLayout.zIndexStride) = 1;
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*(u32*)(interface->vertexLayout.indexBuffer + i*interface->vertexLayout.indexStride) = i;
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}
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// end dummy test code
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glUseProgram(backend->program);
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glBindBuffer(GL_ARRAY_BUFFER, backend->dummyVertexBuffer);
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glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, backend->vertexBuffer);
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glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, backend->indexBuffer);
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glUniform1i(0, indexCount);
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glDrawArrays(GL_TRIANGLES, 0, 6);
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}
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#define LayoutNext(prevName, prevType, nextType) \
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AlignUpOnPow2(_cat3_(LAYOUT_, prevName, _OFFSET)+_cat3_(LAYOUT_, prevType, _SIZE), _cat3_(LAYOUT_, nextType, _ALIGN))
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enum {
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LAYOUT_VEC2_SIZE = 8,
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LAYOUT_VEC2_ALIGN = 8,
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LAYOUT_VEC4_SIZE = 16,
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LAYOUT_VEC4_ALIGN = 16,
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LAYOUT_INT_SIZE = 4,
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LAYOUT_INT_ALIGN = 4,
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LAYOUT_POS_OFFSET = 0,
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LAYOUT_CUBIC_OFFSET = LayoutNext(POS, VEC2, VEC4),
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LAYOUT_UV_OFFSET = LayoutNext(CUBIC, VEC4, VEC2),
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LAYOUT_COLOR_OFFSET = LayoutNext(UV, VEC2, VEC4),
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LAYOUT_CLIP_OFFSET = LayoutNext(COLOR, VEC4, VEC4),
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LAYOUT_ZINDEX_OFFSET = LayoutNext(CLIP, VEC4, INT),
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LAYOUT_VERTEX_ALIGN = 16,
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LAYOUT_VERTEX_SIZE = LayoutNext(ZINDEX, INT, VERTEX),
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};
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enum {
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MG_GLES_CANVAS_DEFAULT_BUFFER_LENGTH = 1<<20,
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MG_GLES_CANVAS_VERTEX_BUFFER_SIZE = MG_GLES_CANVAS_DEFAULT_BUFFER_LENGTH * LAYOUT_VERTEX_SIZE,
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MG_GLES_CANVAS_INDEX_BUFFER_SIZE = MG_GLES_CANVAS_DEFAULT_BUFFER_LENGTH * LAYOUT_INT_SIZE,
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};
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void mg_gles_canvas_update_vertex_layout(mg_gles_canvas_backend* backend)
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{
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if(backend->vertexMapping)
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{
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glUnmapBuffer(backend->vertexBuffer);
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}
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glBindBuffer(GL_SHADER_STORAGE_BUFFER, backend->vertexBuffer);
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backend->vertexMapping = glMapBufferRange(GL_SHADER_STORAGE_BUFFER, 0, MG_GLES_CANVAS_VERTEX_BUFFER_SIZE, GL_MAP_WRITE_BIT);
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if(backend->indexMapping)
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{
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free(backend->indexMapping);
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}
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glBindBuffer(GL_SHADER_STORAGE_BUFFER, backend->indexBuffer);
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backend->indexMapping = glMapBufferRange(GL_SHADER_STORAGE_BUFFER, 0, MG_GLES_CANVAS_INDEX_BUFFER_SIZE, GL_MAP_WRITE_BIT);
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backend->interface.vertexLayout = (mg_vertex_layout){
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.maxVertexCount = MG_GLES_CANVAS_DEFAULT_BUFFER_LENGTH,
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.maxIndexCount = MG_GLES_CANVAS_DEFAULT_BUFFER_LENGTH,
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.posBuffer = backend->vertexMapping + LAYOUT_POS_OFFSET,
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.posStride = LAYOUT_VERTEX_SIZE,
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.cubicBuffer = backend->vertexMapping + LAYOUT_CUBIC_OFFSET,
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.cubicStride = LAYOUT_VERTEX_SIZE,
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.uvBuffer = backend->vertexMapping + LAYOUT_UV_OFFSET,
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.uvStride = LAYOUT_VERTEX_SIZE,
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.colorBuffer = backend->vertexMapping + LAYOUT_COLOR_OFFSET,
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.colorStride = LAYOUT_VERTEX_SIZE,
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.clipBuffer = backend->vertexMapping + LAYOUT_CLIP_OFFSET,
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.clipStride = LAYOUT_VERTEX_SIZE,
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.zIndexBuffer = backend->vertexMapping + LAYOUT_ZINDEX_OFFSET,
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.zIndexStride = LAYOUT_VERTEX_SIZE,
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.indexBuffer = backend->indexMapping,
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.indexStride = LAYOUT_INT_SIZE};
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}
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void mg_gles_canvas_destroy(mg_canvas_backend* interface)
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{
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mg_gles_canvas_backend* backend = (mg_gles_canvas_backend*)interface;
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//TODO
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}
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void mg_gles_canvas_atlas_upload(mg_canvas_backend* interface, mp_rect rect, u8* bytes)
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{
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//TODO
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}
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void compile_shader(GLuint shader, const char* source)
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{
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glShaderSource(shader, 1, &source, 0);
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glCompileShader(shader);
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int err = glGetError();
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if(err)
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{
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printf("gl error: %i\n", err);
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}
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int status = 0;
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glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
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if(!status)
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{
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char buffer[256];
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int size = 0;
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glGetShaderInfoLog(shader, 256, &size, buffer);
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printf("shader error: %.*s\n", size, buffer);
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}
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}
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mg_canvas_backend* mg_gles_canvas_create(mg_surface surface)
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{
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mg_gles_canvas_backend* backend = 0;
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mg_surface_data* surfaceData = mg_surface_data_from_handle(surface);
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if(surfaceData && surfaceData->backend == MG_BACKEND_GLES)
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{
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mg_gles_surface* glesSurface = (mg_gles_surface*)surfaceData;
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backend = malloc_type(mg_gles_canvas_backend);
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memset(backend, 0, sizeof(mg_gles_canvas_backend));
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backend->surface = surface;
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//NOTE(martin): setup interface functions
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backend->interface.destroy = mg_gles_canvas_destroy;
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backend->interface.drawBuffers = mg_gles_canvas_draw_buffers;
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backend->interface.atlasUpload = mg_gles_canvas_atlas_upload;
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mg_surface_prepare(surface);
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GLuint vao;
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glGenVertexArrays(1, &vao);
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glBindVertexArray(vao);
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glGenBuffers(1, &backend->vertexBuffer);
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glBindBuffer(GL_SHADER_STORAGE_BUFFER, backend->vertexBuffer);
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glBufferData(GL_SHADER_STORAGE_BUFFER, MG_GLES_CANVAS_VERTEX_BUFFER_SIZE, 0, GL_DYNAMIC_DRAW);
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glGenBuffers(1, &backend->indexBuffer);
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glBindBuffer(GL_SHADER_STORAGE_BUFFER, backend->indexBuffer);
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glBufferData(GL_SHADER_STORAGE_BUFFER, MG_GLES_CANVAS_INDEX_BUFFER_SIZE, 0, GL_DYNAMIC_DRAW);
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glGenBuffers(1, &backend->dummyVertexBuffer);
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glBindBuffer(GL_ARRAY_BUFFER, backend->dummyVertexBuffer);
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unsigned int vertexShader = glCreateShader(GL_VERTEX_SHADER);
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unsigned int fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
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backend->program = glCreateProgram();
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compile_shader(vertexShader, gles_canvas_vertex);
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compile_shader(fragmentShader, gles_canvas_fragment);
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glAttachShader(backend->program, vertexShader);
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glAttachShader(backend->program, fragmentShader);
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glLinkProgram(backend->program);
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int status = 0;
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glGetProgramiv(backend->program, GL_LINK_STATUS, &status);
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if(!status)
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{
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char buffer[256];
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int size = 0;
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glGetProgramInfoLog(backend->program, 256, &size, buffer);
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printf("link error: %.*s\n", size, buffer);
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}
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glUseProgram(backend->program);
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mg_gles_canvas_update_vertex_layout(backend);
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}
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return((mg_canvas_backend*)backend);
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}
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#undef LOG_SUBSYSTEM
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/*********************************************************************
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*
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* file: gles_canvas_shaders.h
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* note: string literals auto-generated by embed_text.py
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* date: 31/012023
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*
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**********************************************************************/
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#ifndef __GLES_CANVAS_SHADERS_H__
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#define __GLES_CANVAS_SHADERS_H__
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//NOTE: string imported from src\gles_canvas_shaders\gles_canvas_fragment.glsl
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const char* gles_canvas_fragment =
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"#version 310 es\n"
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"\n"
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"precision mediump float;\n"
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"layout(std430) buffer;\n"
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"\n"
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"struct vertex {\n"
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" vec2 pos;\n"
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" vec4 cubic;\n"
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" vec2 uv;\n"
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" vec4 color;\n"
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" vec4 clip;\n"
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" int zIndex;\n"
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"};\n"
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"\n"
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"layout(binding = 0) buffer vertexBufferSSBO {\n"
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" vertex elements[];\n"
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"} vertexBuffer ;\n"
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"\n"
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"layout(binding = 1) buffer indexBufferSSBO {\n"
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" vec2 elements[];\n"
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"} indexBuffer ;\n"
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"\n"
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"layout(location = 0) uniform int indexCount;\n"
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"layout(location = 0) out vec4 fragColor;\n"
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"\n"
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"void main()\n"
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"{\n"
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" fragColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
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"}\n";
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//NOTE: string imported from src\gles_canvas_shaders\gles_canvas_vertex.glsl
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const char* gles_canvas_vertex =
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"#version 310 es\n"
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"\n"
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"precision mediump float;\n"
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"\n"
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"void main()\n"
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"{\n"
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" float x = float(((uint(gl_VertexID) + 2u) / 3u)%2u);\n"
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" float y = float(((uint(gl_VertexID) + 1u) / 3u)%2u);\n"
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"\n"
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" gl_Position = vec4(-1.0f + x*2.0f, -1.0f+y*2.0f, 0.0f, 1.0f);\n"
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"}\n";
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#endif // __GLES_CANVAS_SHADERS_H__
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@ -0,0 +1,29 @@
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#version 310 es
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precision mediump float;
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layout(std430) buffer;
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struct vertex {
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vec2 pos;
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vec4 cubic;
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vec2 uv;
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vec4 color;
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vec4 clip;
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int zIndex;
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};
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layout(binding = 0) buffer vertexBufferSSBO {
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vertex elements[];
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} vertexBuffer ;
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layout(binding = 1) buffer indexBufferSSBO {
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vec2 elements[];
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} indexBuffer ;
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layout(location = 0) uniform int indexCount;
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layout(location = 0) out vec4 fragColor;
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void main()
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{
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fragColor = vec4(0.0, 1.0, 0.0, 1.0);
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}
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@ -0,0 +1,11 @@
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#version 310 es
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precision mediump float;
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void main()
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{
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float x = float(((uint(gl_VertexID) + 2u) / 3u)%2u);
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float y = float(((uint(gl_VertexID) + 1u) / 3u)%2u);
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gl_Position = vec4(-1.0f + x*2.0f, -1.0f+y*2.0f, 0.0f, 1.0f);
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}
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