orca/src/gl_canvas.c

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/************************************************************//**
*
* @file: gl_canvas.c
* @author: Martin Fouilleul
* @date: 29/01/2023
* @revision:
*
*****************************************************************/
#include"graphics_internal.h"
#include"macro_helpers.h"
#include"gles_canvas_shaders.h"
#define LOG_SUBSYSTEM "Graphics"
typedef struct mg_gl_canvas_backend
{
mg_canvas_backend interface;
mg_surface surface;
GLint dummyVertexBuffer;
GLint vertexBuffer;
GLint shapeBuffer;
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GLint indexBuffer;
GLint tileCounterBuffer;
GLint tileArrayBuffer;
GLint clearCounterProgram;
GLint tileProgram;
GLint sortProgram;
GLint drawProgram;
GLint blitProgram;
GLint outTexture;
char* indexMapping;
char* vertexMapping;
char* shapeMapping;
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} mg_gl_canvas_backend;
mg_gl_surface* mg_gl_canvas_get_surface(mg_gl_canvas_backend* canvas)
{
mg_gl_surface* res = 0;
mg_surface_data* data = mg_surface_data_from_handle(canvas->surface);
if(data && data->backend == MG_BACKEND_GL)
{
res = (mg_gl_surface*)data;
}
return(res);
}
//NOTE: debugger
typedef struct debug_vertex
{
vec4 cubic;
vec2 pos;
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int zIndex;
u8 pad[4];
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} debug_vertex;
typedef struct debug_shape
{
vec4 color;
vec4 clip;
vec2 uv;
u8 pad[8];
} debug_shape;
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#define LayoutNext(prevName, prevType, nextType) \
AlignUpOnPow2(_cat3_(LAYOUT_, prevName, _OFFSET)+_cat3_(LAYOUT_, prevType, _SIZE), _cat3_(LAYOUT_, nextType, _ALIGN))
enum {
LAYOUT_VEC2_SIZE = 8,
LAYOUT_VEC2_ALIGN = 8,
LAYOUT_VEC4_SIZE = 16,
LAYOUT_VEC4_ALIGN = 16,
LAYOUT_INT_SIZE = 4,
LAYOUT_INT_ALIGN = 4,
LAYOUT_CUBIC_OFFSET = 0,
LAYOUT_POS_OFFSET = LayoutNext(CUBIC, VEC4, VEC2),
LAYOUT_ZINDEX_OFFSET = LayoutNext(POS, VEC2, INT),
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LAYOUT_VERTEX_ALIGN = 16,
LAYOUT_VERTEX_SIZE = LayoutNext(ZINDEX, INT, VERTEX),
LAYOUT_COLOR_OFFSET = 0,
LAYOUT_CLIP_OFFSET = LayoutNext(COLOR, VEC4, VEC4),
LAYOUT_UV_OFFSET = LayoutNext(CLIP, VEC4, VEC2),
LAYOUT_SHAPE_ALIGN = 16,
LAYOUT_SHAPE_SIZE = LayoutNext(UV, VEC2, SHAPE)
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};
enum {
MG_GL_CANVAS_DEFAULT_BUFFER_LENGTH = 1<<20,
MG_GL_CANVAS_VERTEX_BUFFER_SIZE = MG_GL_CANVAS_DEFAULT_BUFFER_LENGTH * LAYOUT_VERTEX_SIZE,
MG_GL_CANVAS_SHAPE_BUFFER_SIZE = MG_GL_CANVAS_DEFAULT_BUFFER_LENGTH * LAYOUT_SHAPE_SIZE,
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MG_GL_CANVAS_INDEX_BUFFER_SIZE = MG_GL_CANVAS_DEFAULT_BUFFER_LENGTH * LAYOUT_INT_SIZE,
MG_GL_CANVAS_TILE_COUNTER_BUFFER_SIZE = 65536,
MG_GL_CANVAS_TILE_ARRAY_SIZE = sizeof(int)*4096,
MG_GL_CANVAS_TILE_ARRAY_BUFFER_SIZE = MG_GL_CANVAS_TILE_COUNTER_BUFFER_SIZE * MG_GL_CANVAS_TILE_ARRAY_SIZE,
};
void mg_gl_canvas_update_vertex_layout(mg_gl_canvas_backend* backend)
{
backend->interface.vertexLayout = (mg_vertex_layout){
.maxVertexCount = MG_GL_CANVAS_DEFAULT_BUFFER_LENGTH,
.maxIndexCount = MG_GL_CANVAS_DEFAULT_BUFFER_LENGTH,
.posBuffer = backend->vertexMapping + LAYOUT_POS_OFFSET,
.posStride = LAYOUT_VERTEX_SIZE,
.cubicBuffer = backend->vertexMapping + LAYOUT_CUBIC_OFFSET,
.cubicStride = LAYOUT_VERTEX_SIZE,
.zIndexBuffer = backend->vertexMapping + LAYOUT_ZINDEX_OFFSET,
.zIndexStride = LAYOUT_VERTEX_SIZE,
.colorBuffer = backend->shapeMapping + LAYOUT_COLOR_OFFSET,
.colorStride = LAYOUT_SHAPE_SIZE,
.clipBuffer = backend->shapeMapping + LAYOUT_CLIP_OFFSET,
.clipStride = LAYOUT_SHAPE_SIZE,
.uvBuffer = backend->shapeMapping + LAYOUT_UV_OFFSET,
.uvStride = LAYOUT_SHAPE_SIZE,
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.indexBuffer = backend->indexMapping,
.indexStride = LAYOUT_INT_SIZE};
}
void mg_gl_send_buffers(mg_gl_canvas_backend* backend, int shapeCount, int vertexCount, int indexCount)
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{
glBindBuffer(GL_SHADER_STORAGE_BUFFER, backend->vertexBuffer);
glBufferData(GL_SHADER_STORAGE_BUFFER, LAYOUT_VERTEX_SIZE*vertexCount, backend->vertexMapping, GL_STREAM_DRAW);
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glBindBuffer(GL_SHADER_STORAGE_BUFFER, backend->shapeBuffer);
glBufferData(GL_SHADER_STORAGE_BUFFER, LAYOUT_SHAPE_SIZE*shapeCount, backend->shapeMapping, GL_STREAM_DRAW);
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glBindBuffer(GL_SHADER_STORAGE_BUFFER, backend->indexBuffer);
glBufferData(GL_SHADER_STORAGE_BUFFER, LAYOUT_INT_SIZE*indexCount, backend->indexMapping, GL_STREAM_DRAW);
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}
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void mg_gl_canvas_begin(mg_canvas_backend* interface)
{
mg_gl_canvas_backend* backend = (mg_gl_canvas_backend*)interface;
mg_gl_surface* surface = mg_gl_canvas_get_surface(backend);
if(!surface)
{
return;
}
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
void mg_gl_canvas_end(mg_canvas_backend* interface)
{
//NOTE: nothing to do here...
}
void mg_gl_canvas_clear(mg_canvas_backend* interface, mg_color clearColor)
{
mg_gl_canvas_backend* backend = (mg_gl_canvas_backend*)interface;
mg_gl_surface* surface = mg_gl_canvas_get_surface(backend);
if(!surface)
{
return;
}
glClearColor(clearColor.r, clearColor.g, clearColor.b, clearColor.a);
glClear(GL_COLOR_BUFFER_BIT);
}
void mg_gl_canvas_draw_batch(mg_canvas_backend* interface, u32 shapeCount, u32 vertexCount, u32 indexCount)
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{
mg_gl_canvas_backend* backend = (mg_gl_canvas_backend*)interface;
mg_gl_surface* surface = mg_gl_canvas_get_surface(backend);
if(!surface)
{
return;
}
/*NOTE: if we want debug_vertex while debugging, the following ensures the struct def doesn't get stripped away
debug_vertex vertex;
debug_shape shape;
printf("foo %p, bar %p\n", &vertex, &shape);
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//*/
mg_gl_send_buffers(backend, shapeCount, vertexCount, indexCount);
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mp_rect frame = mg_surface_get_frame(backend->surface);
const int tileSize = 16;
const int tileCountX = (frame.w + tileSize - 1)/tileSize;
const int tileCountY = (frame.h + tileSize - 1)/tileSize;
const int tileArraySize = MG_GL_CANVAS_TILE_ARRAY_SIZE;
//TODO: ensure there's enough space in tile buffer
//NOTE: first clear counters
glUseProgram(backend->clearCounterProgram);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, backend->tileCounterBuffer);
glDispatchCompute(tileCountX*tileCountY, 1, 1);
//NOTE: we first distribute triangles into tiles:
glUseProgram(backend->tileProgram);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, backend->vertexBuffer);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, backend->shapeBuffer);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, backend->indexBuffer);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 3, backend->tileCounterBuffer);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 4, backend->tileArrayBuffer);
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glUniform1ui(0, indexCount);
glUniform2ui(1, tileCountX, tileCountY);
glUniform1ui(2, tileSize);
glUniform1ui(3, tileArraySize);
u32 threadCount = indexCount/3;
glDispatchCompute((threadCount + 255)/256, 1, 1);
//NOTE: next we sort triangles in each tile
glUseProgram(backend->sortProgram);
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glUniform1ui(0, indexCount);
glUniform2ui(1, tileCountX, tileCountY);
glUniform1ui(2, tileSize);
glUniform1ui(3, tileArraySize);
glDispatchCompute(tileCountX * tileCountY, 1, 1);
//NOTE: then we fire the fragment shader that will select only triangles in its tile
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glUseProgram(backend->drawProgram);
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glBindImageTexture(0, backend->outTexture, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA8);
glUniform1ui(0, indexCount);
glUniform2ui(1, tileCountX, tileCountY);
glUniform1ui(2, tileSize);
glUniform1ui(3, tileArraySize);
glDispatchCompute(tileCountX, tileCountY, 1);
//NOTE: now blit out texture to surface
glUseProgram(backend->blitProgram);
glBindBuffer(GL_ARRAY_BUFFER, backend->dummyVertexBuffer);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, backend->outTexture);
glUniform1i(0, 0);
glDrawArrays(GL_TRIANGLES, 0, 6);
mg_gl_canvas_update_vertex_layout(backend);
}
void mg_gl_canvas_destroy(mg_canvas_backend* interface)
{
mg_gl_canvas_backend* backend = (mg_gl_canvas_backend*)interface;
//TODO
}
void mg_gl_canvas_atlas_upload(mg_canvas_backend* interface, mp_rect rect, u8* bytes)
{
//TODO
}
static void mg_gl_compile_shader(GLuint shader, const char* source)
{
glShaderSource(shader, 1, &source, 0);
glCompileShader(shader);
int err = glGetError();
if(err)
{
printf("gl error: %i\n", err);
}
int status = 0;
glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
if(!status)
{
char buffer[256];
int size = 0;
glGetShaderInfoLog(shader, 256, &size, buffer);
printf("shader error: %.*s\n", size, buffer);
}
}
mg_canvas_backend* mg_gl_canvas_create(mg_surface surface)
{
mg_gl_canvas_backend* backend = 0;
mg_surface_data* surfaceData = mg_surface_data_from_handle(surface);
if(surfaceData && surfaceData->backend == MG_BACKEND_GL)
{
mg_gl_surface* glSurface = (mg_gl_surface*)surfaceData;
backend = malloc_type(mg_gl_canvas_backend);
memset(backend, 0, sizeof(mg_gl_canvas_backend));
backend->surface = surface;
//NOTE(martin): setup interface functions
backend->interface.destroy = mg_gl_canvas_destroy;
backend->interface.begin = mg_gl_canvas_begin;
backend->interface.end = mg_gl_canvas_end;
backend->interface.clear = mg_gl_canvas_clear;
backend->interface.drawBatch = mg_gl_canvas_draw_batch;
backend->interface.atlasUpload = mg_gl_canvas_atlas_upload;
mg_surface_prepare(surface);
GLuint vao;
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
glGenBuffers(1, &backend->dummyVertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, backend->dummyVertexBuffer);
glGenBuffers(1, &backend->vertexBuffer);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, backend->vertexBuffer);
glBufferData(GL_SHADER_STORAGE_BUFFER, MG_GL_CANVAS_VERTEX_BUFFER_SIZE, 0, GL_STREAM_DRAW);
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glGenBuffers(1, &backend->shapeBuffer);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, backend->shapeBuffer);
glBufferData(GL_SHADER_STORAGE_BUFFER, MG_GL_CANVAS_SHAPE_BUFFER_SIZE, 0, GL_STREAM_DRAW);
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glGenBuffers(1, &backend->indexBuffer);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, backend->indexBuffer);
glBufferData(GL_SHADER_STORAGE_BUFFER, MG_GL_CANVAS_INDEX_BUFFER_SIZE, 0, GL_STREAM_DRAW);
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glGenBuffers(1, &backend->tileCounterBuffer);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, backend->tileCounterBuffer);
glBufferData(GL_SHADER_STORAGE_BUFFER, MG_GL_CANVAS_TILE_COUNTER_BUFFER_SIZE, 0, GL_DYNAMIC_COPY);
glGenBuffers(1, &backend->tileArrayBuffer);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, backend->tileArrayBuffer);
glBufferData(GL_SHADER_STORAGE_BUFFER, MG_GL_CANVAS_TILE_ARRAY_BUFFER_SIZE, 0, GL_DYNAMIC_COPY);
mp_rect frame = mg_surface_get_frame(backend->surface);
glGenTextures(1, &backend->outTexture);
glBindTexture(GL_TEXTURE_2D, backend->outTexture);
glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, frame.w, frame.h);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
//NOTE: create clear program
{
GLuint clearShader = glCreateShader(GL_COMPUTE_SHADER);
backend->clearCounterProgram = glCreateProgram();
mg_gl_compile_shader(clearShader, gles_canvas_clear_counters);
glAttachShader(backend->clearCounterProgram, clearShader);
glLinkProgram(backend->clearCounterProgram);
int status = 0;
glGetProgramiv(backend->clearCounterProgram, GL_LINK_STATUS, &status);
if(!status)
{
char buffer[256];
int size = 0;
glGetProgramInfoLog(backend->clearCounterProgram, 256, &size, buffer);
printf("link error in gl_canvas_clear_counters: %.*s\n", size, buffer);
exit(-1);
}
}
//NOTE: create tile program
{
GLuint tileShader = glCreateShader(GL_COMPUTE_SHADER);
backend->tileProgram = glCreateProgram();
mg_gl_compile_shader(tileShader, gles_canvas_tile);
glAttachShader(backend->tileProgram, tileShader);
glLinkProgram(backend->tileProgram);
int status = 0;
glGetProgramiv(backend->tileProgram, GL_LINK_STATUS, &status);
if(!status)
{
char buffer[256];
int size = 0;
glGetProgramInfoLog(backend->tileProgram, 256, &size, buffer);
printf("link error in gl_canvas_tile: %.*s\n", size, buffer);
exit(-1);
}
}
//NOTE: create sort program
{
GLuint sortShader = glCreateShader(GL_COMPUTE_SHADER);
backend->sortProgram = glCreateProgram();
mg_gl_compile_shader(sortShader, gles_canvas_sort);
glAttachShader(backend->sortProgram, sortShader);
glLinkProgram(backend->sortProgram);
int status = 0;
glGetProgramiv(backend->sortProgram, GL_LINK_STATUS, &status);
if(!status)
{
char buffer[256];
int size = 0;
glGetProgramInfoLog(backend->sortProgram, 256, &size, buffer);
printf("link error gl_canvas_sort: %.*s\n", size, buffer);
exit(-1);
}
}
//NOTE: create draw program
{
GLuint shader = glCreateShader(GL_COMPUTE_SHADER);
backend->drawProgram = glCreateProgram();
mg_gl_compile_shader(shader, gles_canvas_draw);
glAttachShader(backend->drawProgram, shader);
glLinkProgram(backend->drawProgram);
int status = 0;
glGetProgramiv(backend->drawProgram, GL_LINK_STATUS, &status);
if(!status)
{
char buffer[256];
int size = 0;
glGetProgramInfoLog(backend->drawProgram, 256, &size, buffer);
printf("link error gl_canvas_draw: %.*s\n", size, buffer);
exit(-1);
}
}
//NOTE: create blit program
{
GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
backend->blitProgram = glCreateProgram();
mg_gl_compile_shader(vertexShader, gles_canvas_blit_vertex);
mg_gl_compile_shader(fragmentShader, gles_canvas_blit_fragment);
glAttachShader(backend->blitProgram, vertexShader);
glAttachShader(backend->blitProgram, fragmentShader);
glLinkProgram(backend->blitProgram);
int status = 0;
glGetProgramiv(backend->blitProgram, GL_LINK_STATUS, &status);
if(!status)
{
char buffer[256];
int size = 0;
glGetProgramInfoLog(backend->blitProgram, 256, &size, buffer);
printf("link error gl_canvas_blit: %.*s\n", size, buffer);
exit(-1);
}
}
backend->vertexMapping = malloc_array(char, 1<<30);
backend->shapeMapping = malloc_array(char, 1<<30);
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backend->indexMapping = malloc_array(char, 1<<30);
mg_gl_canvas_update_vertex_layout(backend);
}
return((mg_canvas_backend*)backend);
}
#undef LOG_SUBSYSTEM