Add support for vertex and geometry shader textures

src/gpu/gl/GrGLCaps.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLCaps.h"
 
 #include "GrContextOptions.h"
 #include "GrGLContext.h"
 #include "GrGLRenderTarget.h"
 #include "glsl/GrGLSLCaps.h"
 #include "SkTSearch.h"
 #include "SkTSort.h"
 
 GrGLCaps::GrGLCaps(const GrContextOptions& contextOptions,
                    const GrGLContextInfo& ctxInfo,
                    const GrGLInterface* glInterface) : INHERITED(contextOptions) {
     fStandard = ctxInfo.standard();
 
     fStencilFormats.reset();
     fMSFBOType = kNone_MSFBOType;
     fInvalidateFBType = kNone_InvalidateFBType;
     fMapBufferType = kNone_MapBufferType;
     fTransferBufferType = kNone_TransferBufferType;
     fMaxFragmentUniformVectors = 0;
     fMaxVertexAttributes = 0;
-    fMaxFragmentTextureUnits = 0;
     fUnpackRowLengthSupport = false;
     fUnpackFlipYSupport = false;
     fPackRowLengthSupport = false;
     fPackFlipYSupport = false;
     fTextureUsageSupport = false;
     fTextureRedSupport = false;
     fImagingSupport = false;
     fVertexArrayObjectSupport = false;
     fDirectStateAccessSupport = false;
     fDebugSupport = false;
     fES2CompatibilitySupport = false;
     fMultisampleDisableSupport = false;
     fDrawIndirectSupport = false;
     fMultiDrawIndirectSupport = false;
     fBaseInstanceSupport = false;
     fUseNonVBOVertexAndIndexDynamicData = false;
     fIsCoreProfile = false;
     fBindFragDataLocationSupport = false;
-    fExternalTextureSupport = false;
     fRectangleTextureSupport = false;
     fTextureSwizzleSupport = false;
     fSRGBWriteControl = false;
     fRGBA8888PixelsOpsAreSlow = false;
     fPartialFBOReadIsSlow = false;
     fMipMapLevelAndLodControlSupport = false;
 
     fBlitFramebufferSupport = kNone_BlitFramebufferSupport;
 
     fShaderCaps.reset(new GrGLSLCaps(contextOptions));
@@ skipping 19 matching lines @@
         GrGLint max;
         GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, &max);
         fMaxFragmentUniformVectors = max / 4;
         if (version >= GR_GL_VER(3, 2)) {
             GrGLint profileMask;
             GR_GL_GetIntegerv(gli, GR_GL_CONTEXT_PROFILE_MASK, &profileMask);
             fIsCoreProfile = SkToBool(profileMask & GR_GL_CONTEXT_CORE_PROFILE_BIT);
         }
     }
     GR_GL_GetIntegerv(gli, GR_GL_MAX_VERTEX_ATTRIBS, &fMaxVertexAttributes);
-    GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_IMAGE_UNITS, &fMaxFragmentTextureUnits);
 
     if (kGL_GrGLStandard == standard) {
         fUnpackRowLengthSupport = true;
         fUnpackFlipYSupport = false;
         fPackRowLengthSupport = true;
         fPackFlipYSupport = false;
     } else {
         fUnpackRowLengthSupport = version >= GR_GL_VER(3,0) ||
                                   ctxInfo.hasExtension("GL_EXT_unpack_subimage");
         fUnpackFlipYSupport = ctxInfo.hasExtension("GL_CHROMIUM_flipy");
@@ skipping 106 matching lines @@
             fBindFragDataLocationSupport = true;
         }
     }
 
 #if 0 // Disabled due to https://bug.skia.org/4454
     fBindUniformLocationSupport = ctxInfo.hasExtension("GL_CHROMIUM_bind_uniform_location");
 #else
     fBindUniformLocationSupport = false;
 #endif
 
-    if (ctxInfo.hasExtension("GL_OES_EGL_image_external")) {
-        if (ctxInfo.glslGeneration() == k110_GrGLSLGeneration) {
-            fExternalTextureSupport = true;
-        } else if (ctxInfo.hasExtension("GL_OES_EGL_image_external_essl3") ||
-                   ctxInfo.hasExtension("OES_EGL_image_external_essl3")) {
-            // At least one driver has been found that has this extension without the "GL_" prefix.
-            fExternalTextureSupport = true;
-        }
-    }
-
     if (kGL_GrGLStandard == standard) {
         if (version >= GR_GL_VER(3, 1) || ctxInfo.hasExtension("GL_ARB_texture_rectangle")) {
             // We also require textureSize() support for rectangle 2D samplers which was added in
             // GLSL 1.40.
             if (ctxInfo.glslGeneration() >= k140_GrGLSLGeneration) {
                 fRectangleTextureSupport = true;
             }
         }
     } else {
         // Command buffer exposes this in GL ES context for Chromium reasons,
@@ skipping 70 matching lines @@
         #define GL_MAX_SHADER_PIXEL_LOCAL_STORAGE_FAST_SIZE_EXT 0x8F63
         GR_GL_GetIntegerv(gli, GL_MAX_SHADER_PIXEL_LOCAL_STORAGE_FAST_SIZE_EXT, 
                           &glslCaps->fPixelLocalStorageSize);
         glslCaps->fPLSPathRenderingSupport = glslCaps->fFBFetchSupport;
     }
     else {
         glslCaps->fPixelLocalStorageSize = 0;
         glslCaps->fPLSPathRenderingSupport = false;
     }
 
+    // Protect ourselves against tracking huge amounts of texture state.
+    static const uint8_t kMaxSaneSamplers = 32;
+    GrGLint maxSamplers;
+    GR_GL_GetIntegerv(gli, GR_GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &maxSamplers);
+    glslCaps->fMaxVertexSamplers = SkTMin<GrGLint>(kMaxSaneSamplers, maxSamplers);
+    if (glslCaps->fGeometryShaderSupport) {
+        GR_GL_GetIntegerv(gli, GR_GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS, &maxSamplers);
+        glslCaps->fMaxGeometrySamplers = SkTMin<GrGLint>(kMaxSaneSamplers, maxSamplers);
+    }
+    GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_IMAGE_UNITS, &maxSamplers);
+    glslCaps->fMaxFragmentSamplers = SkTMin<GrGLint>(kMaxSaneSamplers, maxSamplers);
+    GR_GL_GetIntegerv(gli, GR_GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &maxSamplers);
+    glslCaps->fMaxCombinedSamplers = SkTMin<GrGLint>(kMaxSaneSamplers, maxSamplers);
+
     /**************************************************************************
      * GrCaps fields
      **************************************************************************/
 
     // We need dual source blending and the ability to disable multisample in order to support mixed
     // samples in every corner case.
     if (fMultisampleDisableSupport &&
         glslCaps->dualSourceBlendingSupport() &&
         fShaderCaps->pathRenderingSupport()) {
         fUsesMixedSamples = ctxInfo.hasExtension("GL_NV_framebuffer_mixed_samples") ||
@@ skipping 365 matching lines @@
         kGLES_GrGLStandard != standard &&
         (ctxInfo.glslGeneration() >= k150_GrGLSLGeneration ||
          ctxInfo.hasExtension("GL_ARB_fragment_coord_conventions"))) {
         glslCaps->fFragCoordConventionsExtensionString = "GL_ARB_fragment_coord_conventions";
     }
 
     if (kGLES_GrGLStandard == standard) {
         glslCaps->fSecondaryOutputExtensionString = "GL_EXT_blend_func_extended";
     }
 
-    if (fExternalTextureSupport) {
+    if (ctxInfo.hasExtension("GL_OES_EGL_image_external")) {
+        if (ctxInfo.glslGeneration() == k110_GrGLSLGeneration) {
+            glslCaps->fExternalTextureSupport = true;
+        } else if (ctxInfo.hasExtension("GL_OES_EGL_image_external_essl3") ||
+                   ctxInfo.hasExtension("OES_EGL_image_external_essl3")) {
+            // At least one driver has been found that has this extension without the "GL_" prefix.
+            glslCaps->fExternalTextureSupport = true;
+        }
+    }
+
+    if (glslCaps->fExternalTextureSupport) {
         if (ctxInfo.glslGeneration() == k110_GrGLSLGeneration) {
             glslCaps->fExternalTextureExtensionString = "GL_OES_EGL_image_external";
         } else {
             glslCaps->fExternalTextureExtensionString = "GL_OES_EGL_image_external_essl3";
         }
     }
 
     // The Tegra3 compiler will sometimes never return if we have min(abs(x), 1.0), so we must do
     // the abs first in a separate expression.
     if (kTegra3_GrGLRenderer == ctxInfo.renderer()) {
@@ skipping 307 matching lines @@
     GR_STATIC_ASSERT(1 == kMapBuffer_MapBufferType);
     GR_STATIC_ASSERT(2 == kMapBufferRange_MapBufferType);
     GR_STATIC_ASSERT(3 == kChromium_MapBufferType);
     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kMapBufferTypeStr) == kLast_MapBufferType + 1);
 
     r.appendf("Core Profile: %s\n", (fIsCoreProfile ? "YES" : "NO"));
     r.appendf("MSAA Type: %s\n", kMSFBOExtStr[fMSFBOType]);
     r.appendf("Invalidate FB Type: %s\n", kInvalidateFBTypeStr[fInvalidateFBType]);
     r.appendf("Map Buffer Type: %s\n", kMapBufferTypeStr[fMapBufferType]);
     r.appendf("Max FS Uniform Vectors: %d\n", fMaxFragmentUniformVectors);
-    r.appendf("Max FS Texture Units: %d\n", fMaxFragmentTextureUnits);
     r.appendf("Max Vertex Attributes: %d\n", fMaxVertexAttributes);
     r.appendf("Unpack Row length support: %s\n", (fUnpackRowLengthSupport ? "YES": "NO"));
     r.appendf("Unpack Flip Y support: %s\n", (fUnpackFlipYSupport ? "YES": "NO"));
     r.appendf("Pack Row length support: %s\n", (fPackRowLengthSupport ? "YES": "NO"));
     r.appendf("Pack Flip Y support: %s\n", (fPackFlipYSupport ? "YES": "NO"));
 
     r.appendf("Texture Usage support: %s\n", (fTextureUsageSupport ? "YES": "NO"));
     r.appendf("GL_R support: %s\n", (fTextureRedSupport ? "YES": "NO"));
     r.appendf("GL_ARB_imaging support: %s\n", (fImagingSupport ? "YES": "NO"));
     r.appendf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
     r.appendf("Direct state access support: %s\n", (fDirectStateAccessSupport ? "YES": "NO"));
     r.appendf("Debug support: %s\n", (fDebugSupport ? "YES": "NO"));
     r.appendf("Multisample disable support: %s\n", (fMultisampleDisableSupport ? "YES" : "NO"));
     r.appendf("Draw indirect support: %s\n", (fDrawIndirectSupport ? "YES" : "NO"));
     r.appendf("Multi draw indirect support: %s\n", (fMultiDrawIndirectSupport ? "YES" : "NO"));
     r.appendf("Base instance support: %s\n", (fBaseInstanceSupport ? "YES" : "NO"));
     r.appendf("Use non-VBO for dynamic data: %s\n",
              (fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
     r.appendf("SRGB write contol: %s\n", (fSRGBWriteControl ? "YES" : "NO"));
     r.appendf("RGBA 8888 pixel ops are slow: %s\n", (fRGBA8888PixelsOpsAreSlow ? "YES" : "NO"));
     r.appendf("Partial FBO read is slow: %s\n", (fPartialFBOReadIsSlow ? "YES" : "NO"));
     r.appendf("Bind uniform location support: %s\n", (fBindUniformLocationSupport ? "YES" : "NO"));
-    r.appendf("External texture support: %s\n", (fExternalTextureSupport ? "YES" : "NO"));
     r.appendf("Rectangle texture support: %s\n", (fRectangleTextureSupport? "YES" : "NO"));
     r.appendf("Texture swizzle support: %s\n", (fTextureSwizzleSupport ? "YES" : "NO"));
 
     r.append("Configs\n-------\n");
     for (int i = 0; i < kGrPixelConfigCnt; ++i) {
         r.appendf("  cfg: %d flags: 0x%04x, b_internal: 0x%08x s_internal: 0x%08x, e_format: "
                   "0x%08x, e_format_teximage: 0x%08x, e_type: 0x%08x, i_for_teximage: 0x%08x, "
                   "i_for_renderbuffer: 0x%08x\n",
                   i,
                   fConfigTable[i].fFlags,
@@ skipping 739 matching lines @@
         for (int j = 0; j < kExternalFormatUsageCnt; ++j) {
             SkASSERT(defaultEntry.fFormats.fExternalFormat[j] !=
                      fConfigTable[i].fFormats.fExternalFormat[j]);
         }
         SkASSERT(defaultEntry.fFormats.fExternalType != fConfigTable[i].fFormats.fExternalType);
     }
 #endif
 }
 
 void GrGLCaps::onApplyOptionsOverrides(const GrContextOptions& options) {}