1 /*
2  * Copyright 2014 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #include "GrGLShaderStringBuilder.h"
9 #include "gl/GrGLGpu.h"
10 #include "gl/GrGLSLPrettyPrint.h"
11 #include "SkRTConf.h"
12 #include "SkTraceEvent.h"
13 
14 #define GL_CALL(X) GR_GL_CALL(gpu->glInterface(), X)
15 #define GL_CALL_RET(R, X) GR_GL_CALL_RET(gpu->glInterface(), R, X)
16 
17 SK_CONF_DECLARE(bool, c_PrintShaders, "gpu.printShaders", false,
18                 "Print the source code for all shaders generated.");
19 
GrGLCompileAndAttachShader(const GrGLContext & glCtx,GrGLuint programId,GrGLenum type,const char ** strings,int * lengths,int count,GrGpu::Stats * stats)20 GrGLuint GrGLCompileAndAttachShader(const GrGLContext& glCtx,
21                                     GrGLuint programId,
22                                     GrGLenum type,
23                                     const char** strings,
24                                     int* lengths,
25                                     int count,
26                                     GrGpu::Stats* stats) {
27     const GrGLInterface* gli = glCtx.interface();
28 
29     GrGLuint shaderId;
30     GR_GL_CALL_RET(gli, shaderId, CreateShader(type));
31     if (0 == shaderId) {
32         return 0;
33     }
34 
35 #ifdef SK_DEBUG
36     SkString prettySource = GrGLSLPrettyPrint::PrettyPrintGLSL(strings, lengths, count, false);
37     const GrGLchar* sourceStr = prettySource.c_str();
38     GrGLint sourceLength = static_cast<GrGLint>(prettySource.size());
39     GR_GL_CALL(gli, ShaderSource(shaderId, 1, &sourceStr, &sourceLength));
40 #else
41     GR_GL_CALL(gli, ShaderSource(shaderId, count, strings, lengths));
42 #endif
43 
44     // If tracing is enabled in chrome then we pretty print
45     bool traceShader;
46     TRACE_EVENT_CATEGORY_GROUP_ENABLED(TRACE_DISABLED_BY_DEFAULT("skia.gpu"), &traceShader);
47     if (traceShader) {
48         SkString shader = GrGLSLPrettyPrint::PrettyPrintGLSL(strings, lengths, count, false);
49         TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("skia.gpu"), "skia_gpu::GLShader",
50                              TRACE_EVENT_SCOPE_THREAD, "shader", TRACE_STR_COPY(shader.c_str()));
51     }
52 
53     stats->incShaderCompilations();
54     GR_GL_CALL(gli, CompileShader(shaderId));
55 
56     // Calling GetShaderiv in Chromium is quite expensive. Assume success in release builds.
57     bool checkCompiled = kChromium_GrGLDriver != glCtx.driver();
58 #ifdef SK_DEBUG
59     checkCompiled = true;
60 #endif
61     if (checkCompiled) {
62         GrGLint compiled = GR_GL_INIT_ZERO;
63         GR_GL_CALL(gli, GetShaderiv(shaderId, GR_GL_COMPILE_STATUS, &compiled));
64 
65         if (!compiled) {
66             GrGLint infoLen = GR_GL_INIT_ZERO;
67             GR_GL_CALL(gli, GetShaderiv(shaderId, GR_GL_INFO_LOG_LENGTH, &infoLen));
68             SkAutoMalloc log(sizeof(char)*(infoLen+1)); // outside if for debugger
69             if (infoLen > 0) {
70                 // retrieve length even though we don't need it to workaround bug in Chromium cmd
71                 // buffer param validation.
72                 GrGLsizei length = GR_GL_INIT_ZERO;
73                 GR_GL_CALL(gli, GetShaderInfoLog(shaderId, infoLen+1, &length, (char*)log.get()));
74                 SkDebugf("%s", GrGLSLPrettyPrint::PrettyPrintGLSL(strings, lengths, count, true).c_str());
75                 SkDebugf("\n%s", log.get());
76             }
77             SkDEBUGFAIL("Shader compilation failed!");
78             GR_GL_CALL(gli, DeleteShader(shaderId));
79             return 0;
80         }
81     }
82 
83     if (c_PrintShaders) {
84         SkDebugf("%s", GrGLSLPrettyPrint::PrettyPrintGLSL(strings, lengths, count, true).c_str());
85         SkDebugf("\n");
86     }
87 
88     // Attach the shader, but defer deletion until after we have linked the program.
89     // This works around a bug in the Android emulator's GLES2 wrapper which
90     // will immediately delete the shader object and free its memory even though it's
91     // attached to a program, which then causes glLinkProgram to fail.
92     GR_GL_CALL(gli, AttachShader(programId, shaderId));
93 
94     return shaderId;
95 }
96