ebiten/graphics/opengl/internal/shader/shader.go
Hajime Hoshi 7d4540d863 gofmt
2014-12-06 22:56:57 +09:00

101 lines
1.8 KiB
Go

package shader
import (
"github.com/go-gl/gl"
"log"
)
type shader struct {
native gl.Shader
shaderType gl.GLenum
source string
}
type shaderId int
const (
shaderVertex shaderId = iota
shaderFragment
shaderColorMatrix
shaderSolidColor
)
var shaders = map[shaderId]*shader{
shaderVertex: {
shaderType: gl.VERTEX_SHADER,
source: `
uniform mat4 projection_matrix;
uniform mat4 modelview_matrix;
attribute vec2 vertex;
attribute vec2 tex_coord;
varying vec2 vertex_out_tex_coord;
void main(void) {
vertex_out_tex_coord = tex_coord;
gl_Position = projection_matrix * modelview_matrix * vec4(vertex, 0, 1);
}
`,
},
shaderFragment: {
shaderType: gl.FRAGMENT_SHADER,
source: `
uniform sampler2D texture;
varying vec2 vertex_out_tex_coord;
void main(void) {
gl_FragColor = texture2D(texture, vertex_out_tex_coord);
}
`,
},
shaderColorMatrix: {
shaderType: gl.FRAGMENT_SHADER,
source: `
uniform sampler2D texture;
uniform mat4 color_matrix;
uniform vec4 color_matrix_translation;
varying vec2 vertex_out_tex_coord;
void main(void) {
vec4 color = texture2D(texture, vertex_out_tex_coord);
gl_FragColor = (color_matrix * color) + color_matrix_translation;
}
`,
},
shaderSolidColor: {
shaderType: gl.FRAGMENT_SHADER,
source: `
uniform vec4 color;
void main(void) {
gl_FragColor = color;
}
`,
},
}
func (s *shader) compile() {
s.native = gl.CreateShader(s.shaderType)
if s.native == 0 {
panic("glCreateShader failed")
}
s.native.Source(s.source)
s.native.Compile()
if s.native.Get(gl.COMPILE_STATUS) == gl.FALSE {
s.showShaderLog()
panic("shader compile failed")
}
}
func (s *shader) showShaderLog() {
if s.native.Get(gl.INFO_LOG_LENGTH) == 0 {
return
}
log.Fatalf("shader error: %s\n", s.native.GetInfoLog())
}
func (s *shader) delete() {
s.native.Delete()
}