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1 files changed, 314 insertions, 0 deletions

diff --git a/src/render/gl_2d.cpp b/src/render/gl_2d.cpp
new file mode 100644
index 0000000..44e7e00
--- /dev/null
+++ b/src/render/gl_2d.cpp
@@ -0,0 +1,314 @@
+#include "gl_2d.h"
+#include "../util.h"
+
+GL_PROGRAM* gl_2d_init( GL_DATA* gl, VEC2 screensize, const char* shadername ) {
+  GL_PROGRAM* program = gl_program_create( gl, shadername );
+  if( !OK( gl_program_compile( gl, program ) ) )
+    dlog( "gl_2d_init() : error compiling shader %s\n", shadername );
+
+  F32 screen_ratio[] = {
+    2.f / screensize.x,
+    2.f / screensize.y,
+    1.f,
+    1.f
+  };
+
+  glUseProgram( program->id );
+  glEnable( GL_BLEND );
+  glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
+
+  I32 ratio_location = glGetUniformLocation( program->id, "g_screenratio" );
+  glUniform4fv( ratio_location, 1, &screen_ratio[0] );
+
+  I32 samplers_location = glGetUniformLocation( program->id, "g_samplers" );
+  glUniform1iv( samplers_location, 255, SAMPLER_INDICES );
+
+  return program;
+}
+
+void gl_2d_line( GL_PROGRAM* gl2d, VEC2 start, VEC2 end, CLR col ) {
+  static const U16 order[] = { 0, 1 };
+
+  glUseProgram( gl2d->id );
+
+  VERTEX vertices[] = {
+    { .pos = { start.x, start.y }, .clr = col },
+    { .pos = { end.x,   end.y   }, .clr = col },
+  };
+
+  glBindBuffer( GL_ARRAY_BUFFER, gl2d->gl->vbuffer );
+  glBufferData( GL_ARRAY_BUFFER, sizeof(vertices), &vertices[0], GL_DYNAMIC_DRAW );
+  I32 position = glGetAttribLocation( gl2d->id, "in_pos" );
+  glEnableVertexAttribArray( position );
+  glVertexAttribPointer( position, 2, GL_FLOAT, 0, sizeof(VERTEX), 0 );
+  I32 color = glGetAttribLocation( gl2d->id, "in_col" );
+  glEnableVertexAttribArray( color );
+  glVertexAttribPointer( color, 4, GL_FLOAT, 0, sizeof(VERTEX), &( (VERTEX*)nullptr)->clr );
+
+  glBindBuffer( GL_ARRAY_BUFFER, 0 );
+  glDrawElements( GL_LINES, 2, GL_UNSIGNED_SHORT, order );
+}
+
+void gl_2d_rect( GL_PROGRAM* gl2d, VEC2 origin, VEC2 dim, CLR col ) {
+  static const U16 order[] = { 0, 1, 2, 3, 4 };
+
+  glUseProgram( gl2d->id );
+
+  VERTEX vertices[] = {
+    { .pos = { origin.x        , origin.y         }, .clr = col },
+    { .pos = { origin.x + dim.x, origin.y         }, .clr = col },
+    { .pos = { origin.x + dim.x, origin.y + dim.y }, .clr = col },
+    { .pos = { origin.x        , origin.y + dim.y }, .clr = col },
+    { .pos = { origin.x        , origin.y         }, .clr = col },
+  };
+
+  glBindBuffer( GL_ARRAY_BUFFER, gl2d->gl->vbuffer );
+  glBufferData( GL_ARRAY_BUFFER, sizeof(vertices), &vertices[0], GL_DYNAMIC_DRAW );
+  I32 position = glGetAttribLocation( gl2d->id, "in_pos" );
+  glEnableVertexAttribArray( position );
+  glVertexAttribPointer( position, 2, GL_FLOAT, 0, sizeof(VERTEX), 0 );
+  I32 color = glGetAttribLocation( gl2d->id, "in_col" );
+  glEnableVertexAttribArray( color );
+  glVertexAttribPointer( color, 4, GL_FLOAT, 0, sizeof(VERTEX), &( (VERTEX*)nullptr)->clr );
+
+  glBindBuffer( GL_ARRAY_BUFFER, 0 );
+  glDrawElements( GL_LINE_STRIP, 5, GL_UNSIGNED_SHORT, order ); 
+}
+
+void gl_2d_textured_frect( GL_PROGRAM* gl2d, VEC2 origin, VEC2 dim, GL_TEX2D* texture, CLR col, VEC2* uv, F32 rotation ) {
+  static const U16 order[] = { 0, 1, 2, 3 };
+
+  glUseProgram( gl2d->id );
+  VERTEX vertices[] = {
+    { { origin.x,         origin.y         }, uv? uv[0] : VEC2{ 0.f, 0.f }, col, 0 },
+    { { origin.x + dim.x, origin.y         }, uv? uv[1] : VEC2{ 1.f, 0.f }, col, 0 },
+    { { origin.x,         origin.y + dim.y }, uv? uv[2] : VEC2{ 0.f, 1.f }, col, 0 },
+    { { origin.x + dim.x, origin.y + dim.y }, uv? uv[3] : VEC2{ 1.f, 1.f }, col, 0 }
+  };
+
+  rotation = remainderf( rotation, 360.f );
+  if( rotation != 0.f ) {
+    F32 rad2dg = rotation * (M_PI / 180.f);
+
+    // rotate texture coordinates
+    for( U32 i = 0; i < 4; ++i ) {
+      F32 x = vertices[i].uv.x - 0.5f;
+      F32 y = vertices[i].uv.y - 0.5f;
+      vertices[i].uv.x = x * cosf( rad2dg ) - y * sinf( rad2dg ) + 0.5f;
+      vertices[i].uv.y = x * sinf( rad2dg ) + y * cosf( rad2dg ) + 0.5f;
+      if( vertices[i].uv.x < 0.f ) vertices[i].uv.x = 0.f;
+      if( vertices[i].uv.x > 1.f ) vertices[i].uv.x = 1.f;
+    }
+  }
+
+  glBindBuffer( GL_ARRAY_BUFFER, gl2d->gl->vbuffer );
+  glBufferData( GL_ARRAY_BUFFER, sizeof(vertices), &vertices[0], GL_DYNAMIC_DRAW );
+  I32 position = glGetAttribLocation( gl2d->id, "in_pos" );
+  glEnableVertexAttribArray( position );
+  glVertexAttribPointer( position, 2, GL_FLOAT, 0, sizeof(VERTEX), 0 );
+  I32 color = glGetAttribLocation( gl2d->id, "in_col" );
+  glEnableVertexAttribArray( color );
+  glVertexAttribPointer( color, 4, GL_FLOAT, 0, sizeof(VERTEX), &( (VERTEX*)nullptr)->clr );
+  I32 texcoord = glGetAttribLocation( gl2d->id, "in_texcoord" );
+  glEnableVertexAttribArray( texcoord );
+  glVertexAttribPointer( texcoord, 2, GL_FLOAT, 0, sizeof(VERTEX), &( (VERTEX*)nullptr)->uv );
+  I32 sampler = glGetAttribLocation( gl2d->id, "in_sampler" );
+  glEnableVertexAttribArray( sampler );
+  glVertexAttribPointer( sampler, 1, GL_UNSIGNED_BYTE, 1, sizeof(VERTEX), &( (VERTEX*)nullptr)->sampler );
+
+  glBindBuffer( GL_ARRAY_BUFFER, 0 );
+
+  glActiveTexture( GL_TEXTURE0 );
+  glBindTexture( GL_TEXTURE_2D, texture->id );
+
+  glUniform1f( glGetUniformLocation( gl2d->id, "in_time" ), u_time() );
+
+  glDrawElements( GL_TRIANGLE_STRIP, 4, GL_UNSIGNED_SHORT, order );
+  glBindTexture( GL_TEXTURE_2D, 0 );
+}
+
+void gl_2d_frect( GL_PROGRAM* gl2d, VEC2 origin, VEC2 dim, CLR col ) {
+  static const U16 order[] = { 0, 1, 2, 3 };
+
+  glUseProgram( gl2d->id );
+  VERTEX vertices[] = {
+    { .pos = { origin.x,         origin.y         }, .uv = { 0.f, 0.f }, .clr = col },
+    { .pos = { origin.x + dim.x, origin.y         }, .uv = { 1.f, 0.f }, .clr = col },
+    { .pos = { origin.x,         origin.y + dim.y }, .uv = { 0.f, 1.f }, .clr = col },
+    { .pos = { origin.x + dim.x, origin.y + dim.y }, .uv = { 1.f, 1.f }, .clr = col }
+  };
+
+  glBindBuffer( GL_ARRAY_BUFFER, gl2d->gl->vbuffer );
+  glBufferData( GL_ARRAY_BUFFER, sizeof(vertices), &vertices[0], GL_DYNAMIC_DRAW );
+  I32 position = glGetAttribLocation( gl2d->id, "in_pos" );
+  glEnableVertexAttribArray( position );
+  glVertexAttribPointer( position, 2, GL_FLOAT, 0, sizeof(VERTEX), 0 );
+  I32 color = glGetAttribLocation( gl2d->id, "in_col" );
+  glEnableVertexAttribArray( color );
+  glVertexAttribPointer( color, 4, GL_FLOAT, 0, sizeof(VERTEX), &( (VERTEX*)nullptr)->clr );
+  I32 texcoord = glGetAttribLocation( gl2d->id, "in_texcoord" );
+  glEnableVertexAttribArray( texcoord );
+  glVertexAttribPointer( texcoord, 2, GL_FLOAT, 0, sizeof(VERTEX), &( (VERTEX*)nullptr)->uv );
+
+  glBindBuffer( GL_ARRAY_BUFFER, 0 );
+  glDrawElements( GL_TRIANGLE_STRIP, 4, GL_UNSIGNED_SHORT, order );
+}
+
+void gl_2d_circle( GL_PROGRAM* gl2d, VEC2 origin, F32 radius, CLR col, U32 res ) {
+  static U16*      order = 0;
+  const  F32 step = 360.f / (F32)res;
+
+  glUseProgram( gl2d->id );
+
+  if( !order ) {
+    order = (U16*)malloc( sizeof( U16 ) * (res + 1) );
+    for( U32 i = 0; i < res + 1; ++i )
+      order[i] = i;
+  }
+
+  VERTEX* vertices = (VERTEX*)malloc( sizeof( VERTEX ) * (res + 1) );
+  for( U32 i = 0; i < res + 1; ++i ) {
+    VEC2 offset = m_radial_offset( step * ( i == res? 0 : i ), radius );
+
+    vertices[i] = (VERTEX){
+      .pos = {
+        origin.x + offset.x,
+        origin.y + offset.y,
+      },
+      .uv = {},
+      .clr = col
+    };
+  }
+
+  glBindBuffer( GL_ARRAY_BUFFER, gl2d->gl->vbuffer );
+  glBufferData( GL_ARRAY_BUFFER, sizeof(VERTEX) * (res + 1), &vertices[0], GL_STATIC_DRAW );
+  I32 position = glGetAttribLocation( gl2d->id, "in_pos" );
+  glEnableVertexAttribArray( position );
+  glVertexAttribPointer( position, 2, GL_FLOAT, 0, sizeof(VERTEX), 0 );
+  I32 color = glGetAttribLocation( gl2d->id, "in_col" );
+  glEnableVertexAttribArray( color );
+  glVertexAttribPointer( color, 4, GL_FLOAT, 0, sizeof(VERTEX), &( (VERTEX*)nullptr)->clr );
+
+  glBindBuffer( GL_ARRAY_BUFFER, 0 );
+
+  glDrawElements( GL_LINE_STRIP, res + 1, GL_UNSIGNED_SHORT, order );
+  free( vertices );
+}
+
+void gl_2d_fcircle( GL_PROGRAM* gl2d, VEC2 origin, F32 radius, CLR col, U32 res ) {
+  static U16*      order = 0;
+  const  F32 step = 360.f / (F32)res;
+
+  glUseProgram( gl2d->id );
+
+  if( !order ) {
+    order = (U16*)malloc( sizeof( U16 ) * (res * 2) );
+    for( U32 i = 0; i < res * 2; ++i )
+      order[i] = i;
+  }
+
+  VERTEX* vertices = (VERTEX*)malloc( sizeof(VERTEX) * (res * 2) );
+  for( U32 i = 0; i < res * 2; i += 2 ) {
+    VEC2 offset = m_radial_offset( step * i, radius );
+    vertices[i].pos = (VEC2){
+      origin.x,
+      origin.y,
+    };
+
+    vertices[i + 1].pos = (VEC2){
+      origin.x + offset.x,
+      origin.y + offset.y,
+    };
+
+    vertices[i].uv = (VEC2){ 0.5f, 0.5f };
+    vertices[i + 1].uv = (VEC2){
+      0.5f + ( offset.x * 0.5f ) / radius,
+      0.5f + ( offset.y * 0.5f ) / radius
+    };
+
+    vertices[i].clr = col;
+    vertices[i + 1].clr = col;
+  };
+
+  glBindBuffer( GL_ARRAY_BUFFER, gl2d->gl->vbuffer );
+  glBufferData( GL_ARRAY_BUFFER, sizeof(VERTEX) * res * 2, &vertices[0], GL_STATIC_DRAW );
+  I32 position = glGetAttribLocation( gl2d->id, "in_pos" );
+  glEnableVertexAttribArray( position );
+  glVertexAttribPointer( position, 2, GL_FLOAT, 0, sizeof(VERTEX), 0 );
+  I32 color = glGetAttribLocation( gl2d->id, "in_col" );
+  glEnableVertexAttribArray( color );
+  glVertexAttribPointer( color, 4, GL_FLOAT, 0, sizeof(VERTEX), &( (VERTEX*)nullptr)->clr );
+  I32 texcoord = glGetAttribLocation( gl2d->id, "in_texcoord" );
+  glEnableVertexAttribArray( texcoord );
+  glVertexAttribPointer( texcoord, 2, GL_FLOAT, 0, sizeof(VERTEX), &( (VERTEX*)nullptr)->uv );
+
+  glBindBuffer( GL_ARRAY_BUFFER, 0 );
+
+  glDrawElements( GL_TRIANGLE_STRIP, res + 2, GL_UNSIGNED_SHORT, order );
+  free( vertices );
+}
+
+void gl_polygon( GL_PROGRAM* gl2d, VERTEX* vertices, U32 vertices_count ) {
+  glUseProgram( gl2d->id );
+
+  glBindBuffer( GL_ARRAY_BUFFER, gl2d->gl->vbuffer );
+  glBufferData( GL_ARRAY_BUFFER, sizeof(VERTEX) * vertices_count, vertices, GL_STATIC_DRAW );
+
+  I32 position = glGetAttribLocation( gl2d->id, "in_pos" );
+  glEnableVertexAttribArray( position );
+  glVertexAttribPointer( position, 2, GL_FLOAT, 0, sizeof(VERTEX), 0 );
+  I32 color = glGetAttribLocation( gl2d->id, "in_col" );
+  glEnableVertexAttribArray( color );
+  glVertexAttribPointer( color, 4, GL_FLOAT, 0, sizeof(VERTEX), &( (VERTEX*)nullptr)->clr );
+  I32 texcoord = glGetAttribLocation( gl2d->id, "in_texcoord" );
+  glEnableVertexAttribArray( texcoord );
+  glVertexAttribPointer( texcoord, 2, GL_FLOAT, 0, sizeof(VERTEX), &( (VERTEX*)nullptr)->uv );
+
+  glBindBuffer( GL_ARRAY_BUFFER, 0 );
+
+  U16* order = (U16*)alloca( sizeof(U16) * vertices_count );
+  for( U32 i = 0; i < vertices_count; i++ )
+    order[i] = i;
+
+  glDrawElements( GL_TRIANGLE_FAN, vertices_count, GL_UNSIGNED_SHORT, order );
+}
+
+void gl_textured_polygon(
+  GL_PROGRAM *gl2d,
+  VERTEX *vertices,
+  U32 vertices_count,
+  GL_TEX2D *tex
+) {
+  glUseProgram( gl2d->id );
+
+  for( U32 i = 0; i < vertices_count; ++i )
+    vertices[i].sampler = 0;
+
+  glBindBuffer( GL_ARRAY_BUFFER, gl2d->gl->vbuffer );
+  glBufferData( GL_ARRAY_BUFFER, sizeof(VERTEX) * vertices_count, vertices, GL_STATIC_DRAW );
+  I32 position = glGetAttribLocation( gl2d->id, "in_pos" );
+  glEnableVertexAttribArray( position );
+  glVertexAttribPointer( position, 2, GL_FLOAT, 0, sizeof(VERTEX), 0 );
+  I32 color = glGetAttribLocation( gl2d->id, "in_col" );
+  glEnableVertexAttribArray( color );
+  glVertexAttribPointer( color, 4, GL_FLOAT, 0, sizeof(VERTEX), &( (VERTEX*)nullptr)->clr );
+  I32 texcoord = glGetAttribLocation( gl2d->id, "in_texcoord" );
+  glEnableVertexAttribArray( texcoord );
+  glVertexAttribPointer( texcoord, 2, GL_FLOAT, 0, sizeof(VERTEX), &( (VERTEX*)nullptr)->uv );
+  I32 sampler = glGetAttribLocation( gl2d->id, "in_sampler" );
+  glEnableVertexAttribArray( sampler );
+  glVertexAttribPointer( sampler, 1, GL_UNSIGNED_BYTE, 1, sizeof(VERTEX), &( (VERTEX*)nullptr)->sampler );
+
+  glBindBuffer( GL_ARRAY_BUFFER, 0 );
+
+  glActiveTexture( GL_TEXTURE0 );
+  glBindTexture( GL_TEXTURE_2D, tex->id );
+
+  glUniform1f( glGetUniformLocation( gl2d->id, "in_time" ), u_time() );
+
+  U16* order = (U16*)alloca( sizeof(U16) * vertices_count );
+  for( U32 i = 0; i < vertices_count; i++ )
+    order[i] = i;
+
+  glDrawElements( GL_TRIANGLE_FAN, vertices_count, GL_UNSIGNED_SHORT, order );
+}