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#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 );
}
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