forked from joejulian/gio
Elias Naur
afaa31eca8
Modern API such as Metal and Vulkan want clients to compile expensive state changes into pipeline objects. Change our GPU driver abstraction to match, thereby paving the way for future drivers. Signed-off-by: Elias Naur <mail@eliasnaur.com>
88 lines
2.4 KiB
Go
88 lines
2.4 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package gl
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import (
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"errors"
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"fmt"
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"strings"
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)
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func CreateProgram(ctx *Functions, vsSrc, fsSrc string, attribs []string) (Program, error) {
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vs, err := CreateShader(ctx, VERTEX_SHADER, vsSrc)
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if err != nil {
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return Program{}, err
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}
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defer ctx.DeleteShader(vs)
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fs, err := CreateShader(ctx, FRAGMENT_SHADER, fsSrc)
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if err != nil {
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return Program{}, err
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}
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defer ctx.DeleteShader(fs)
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prog := ctx.CreateProgram()
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if !prog.Valid() {
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return Program{}, errors.New("glCreateProgram failed")
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}
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ctx.AttachShader(prog, vs)
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ctx.AttachShader(prog, fs)
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for i, a := range attribs {
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ctx.BindAttribLocation(prog, Attrib(i), a)
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}
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ctx.LinkProgram(prog)
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if ctx.GetProgrami(prog, LINK_STATUS) == 0 {
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log := ctx.GetProgramInfoLog(prog)
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ctx.DeleteProgram(prog)
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return Program{}, fmt.Errorf("program link failed: %s", strings.TrimSpace(log))
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}
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return prog, nil
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}
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func CreateComputeProgram(ctx *Functions, src string) (Program, error) {
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cs, err := CreateShader(ctx, COMPUTE_SHADER, src)
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if err != nil {
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return Program{}, err
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}
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defer ctx.DeleteShader(cs)
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prog := ctx.CreateProgram()
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if !prog.Valid() {
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return Program{}, errors.New("glCreateProgram failed")
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}
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ctx.AttachShader(prog, cs)
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ctx.LinkProgram(prog)
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if ctx.GetProgrami(prog, LINK_STATUS) == 0 {
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log := ctx.GetProgramInfoLog(prog)
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ctx.DeleteProgram(prog)
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return Program{}, fmt.Errorf("program link failed: %s", strings.TrimSpace(log))
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}
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return prog, nil
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}
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func CreateShader(ctx *Functions, typ Enum, src string) (Shader, error) {
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sh := ctx.CreateShader(typ)
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if !sh.Valid() {
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return Shader{}, errors.New("glCreateShader failed")
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}
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ctx.ShaderSource(sh, src)
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ctx.CompileShader(sh)
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if ctx.GetShaderi(sh, COMPILE_STATUS) == 0 {
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log := ctx.GetShaderInfoLog(sh)
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ctx.DeleteShader(sh)
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return Shader{}, fmt.Errorf("shader compilation failed: %s", strings.TrimSpace(log))
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}
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return sh, nil
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}
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func ParseGLVersion(glVer string) (version [2]int, gles bool, err error) {
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var ver [2]int
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if _, err := fmt.Sscanf(glVer, "OpenGL ES %d.%d", &ver[0], &ver[1]); err == nil {
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return ver, true, nil
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} else if _, err := fmt.Sscanf(glVer, "WebGL %d.%d", &ver[0], &ver[1]); err == nil {
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// WebGL major version v corresponds to OpenGL ES version v + 1
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ver[0]++
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return ver, true, nil
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} else if _, err := fmt.Sscanf(glVer, "%d.%d", &ver[0], &ver[1]); err == nil {
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return ver, false, nil
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}
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return ver, false, fmt.Errorf("failed to parse OpenGL ES version (%s)", glVer)
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}
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