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-rw-r--r--opengl/libagl/copybit.cpp370
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+/*
+**
+** Copyright 2009, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+** http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "context.h"
+#include "fp.h"
+#include "state.h"
+#include "matrix.h"
+#include "vertex.h"
+#include "light.h"
+#include "primitives.h"
+#include "texture.h"
+#include "BufferObjectManager.h"
+
+#include "TextureObjectManager.h"
+#include <hardware/gralloc.h>
+#include <hardware/copybit.h>
+#include "gralloc_priv.h"
+
+// ----------------------------------------------------------------------------
+
+namespace android {
+
+static void textureToCopyBitImage(const GGLSurface* surface, int fd, copybit_image_t* img) {
+ img->w = surface->stride;
+ img->h = surface->height;
+ img->format = surface->format;
+ img->offset = 0;
+ img->base = surface->data;
+ img->fd = fd;
+}
+
+struct clipRectRegion : public copybit_region_t {
+ clipRectRegion(ogles_context_t* c) {
+ next = iterate;
+ int x = c->viewport.scissor.x;
+ int y = c->viewport.scissor.y;
+ r.l = x;
+ r.t = y;
+ r.r = x + c->viewport.scissor.w;
+ r.b = y + c->viewport.scissor.h;
+ firstTime = true;
+ }
+private:
+ static int iterate(copybit_region_t const * self, copybit_rect_t* rect) {
+ clipRectRegion* myself = (clipRectRegion*) self;
+ if (myself->firstTime) {
+ myself->firstTime = false;
+ *rect = myself->r;
+ return 1;
+ }
+ return 0;
+ }
+ mutable copybit_rect_t r;
+ mutable bool firstTime;
+};
+
+static bool supportedCopybitsFormat(int format) {
+ switch (format) {
+ case COPYBIT_FORMAT_RGBA_8888:
+ case COPYBIT_FORMAT_RGB_565:
+ case COPYBIT_FORMAT_BGRA_8888:
+ case COPYBIT_FORMAT_RGBA_5551:
+ case COPYBIT_FORMAT_RGBA_4444:
+ case COPYBIT_FORMAT_YCbCr_422_SP:
+ case COPYBIT_FORMAT_YCbCr_420_SP:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool hasAlpha(int format) {
+ switch (format) {
+ case COPYBIT_FORMAT_RGBA_8888:
+ case COPYBIT_FORMAT_BGRA_8888:
+ case COPYBIT_FORMAT_RGBA_5551:
+ case COPYBIT_FORMAT_RGBA_4444:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static inline int fixedToByte(GGLfixed val) {
+ return (val - (val >> 8)) >> 8;
+}
+
+/**
+ * Performs a quick check of the rendering state. If this function returns
+ * false we cannot use the copybit driver.
+ */
+
+static bool checkContext(ogles_context_t* c) {
+
+ // By convenction copybitQuickCheckContext() has already returned true.
+ // avoid checking the same information again.
+
+ if (c->copybits.blitEngine == NULL
+ || (c->rasterizer.state.enables
+ & (GGL_ENABLE_DEPTH_TEST|GGL_ENABLE_FOG)) != 0) {
+ return false;
+ }
+
+ // Note: The drawSurfaceFd is only set for destination
+ // surfaces types that are supported by the hardware and
+ // do not have an alpha channel. So we don't have to re-check that here.
+
+ static const int tmu = 0;
+ texture_unit_t& u(c->textures.tmu[tmu]);
+ EGLTextureObject* textureObject = u.texture;
+
+ if (!supportedCopybitsFormat(textureObject->surface.format)) {
+ return false;
+ }
+ return true;
+}
+
+
+static bool copybit(GLint x, GLint y,
+ GLint w, GLint h,
+ EGLTextureObject* textureObject,
+ const GLint* crop_rect,
+ int transform,
+ ogles_context_t* c)
+{
+ // We assume checkContext has already been called and has already
+ // returned true.
+
+ const GGLSurface& cbSurface = c->rasterizer.state.buffers.color.s;
+
+ y = cbSurface.height - (y + h);
+
+ const GLint Ucr = crop_rect[0];
+ const GLint Vcr = crop_rect[1];
+ const GLint Wcr = crop_rect[2];
+ const GLint Hcr = crop_rect[3];
+
+ int32_t dsdx = (Wcr << 16) / w; // dsdx = ((Wcr/w)/Wt)*Wt
+ int32_t dtdy = ((-Hcr) << 16) / h; // dtdy = -((Hcr/h)/Ht)*Ht
+
+ if (dsdx < c->copybits.minScale || dsdx > c->copybits.maxScale
+ || dtdy < c->copybits.minScale || dtdy > c->copybits.maxScale) {
+ // The requested scale is out of the range the hardware
+ // can support.
+ return false;
+ }
+
+ int32_t texelArea = gglMulx(dtdy, dsdx);
+ if (texelArea < FIXED_ONE && textureObject->mag_filter != GL_LINEAR) {
+ // Non-linear filtering on a texture enlargement.
+ return false;
+ }
+
+ if (texelArea > FIXED_ONE && textureObject->min_filter != GL_LINEAR) {
+ // Non-linear filtering on an texture shrink.
+ return false;
+ }
+
+ const uint32_t enables = c->rasterizer.state.enables;
+ int planeAlpha = 255;
+ static const int tmu = 0;
+ texture_t& tev(c->rasterizer.state.texture[tmu]);
+ bool srcTextureHasAlpha = hasAlpha(textureObject->surface.format);
+ switch (tev.env) {
+
+ case GGL_REPLACE:
+ if (!srcTextureHasAlpha) {
+ planeAlpha = fixedToByte(c->currentColorClamped.a);
+ }
+ break;
+
+ case GGL_MODULATE:
+ if (! (c->currentColorClamped.r == FIXED_ONE
+ && c->currentColorClamped.g == FIXED_ONE
+ && c->currentColorClamped.b == FIXED_ONE)) {
+ return false;
+ }
+ planeAlpha = fixedToByte(c->currentColorClamped.a);
+ break;
+
+ default:
+ // Incompatible texture environment.
+ return false;
+ }
+
+ bool blending = false;
+
+ if ((enables & GGL_ENABLE_BLENDING)
+ && !(c->rasterizer.state.blend.src == GL_ONE
+ && c->rasterizer.state.blend.dst == GL_ZERO)) {
+ // Blending is OK if it is
+ // the exact kind of blending that the copybits hardware supports.
+ // Note: The hardware only supports
+ // GL_SRC_ALPHA / GL_ONE_MINUS_SRC_ALPHA,
+ // But the surface flinger uses GL_ONE / GL_ONE_MINUS_SRC_ALPHA.
+ // We substitute GL_SRC_ALPHA / GL_ONE_MINUS_SRC_ALPHA in that case,
+ // because the performance is worth it, even if the results are
+ // not correct.
+ if (!((c->rasterizer.state.blend.src == GL_SRC_ALPHA
+ || c->rasterizer.state.blend.src == GL_ONE)
+ && c->rasterizer.state.blend.dst == GL_ONE_MINUS_SRC_ALPHA
+ && c->rasterizer.state.blend.alpha_separate == 0)) {
+ // Incompatible blend mode.
+ return false;
+ }
+ blending = true;
+ } else {
+ // No blending is OK if we are not using alpha.
+ if (srcTextureHasAlpha || planeAlpha != 255) {
+ // Incompatible alpha
+ return false;
+ }
+ }
+
+ if (srcTextureHasAlpha && planeAlpha != 255) {
+ // Can't do two types of alpha at once.
+ return false;
+ }
+
+ // LOGW("calling copybits");
+
+ copybit_device_t* copybit = c->copybits.blitEngine;
+ copybit_image_t dst;
+ textureToCopyBitImage(&cbSurface, c->copybits.drawSurfaceFd, &dst);
+ copybit_rect_t drect = {x, y, x+w, y+h};
+
+ copybit_image_t src;
+ textureToCopyBitImage(&textureObject->surface, textureObject->copybits_fd,
+ &src);
+ copybit_rect_t srect = { Ucr, Vcr + Hcr, Ucr + Wcr, Vcr };
+
+ copybit->set_parameter(copybit, COPYBIT_TRANSFORM, transform);
+ copybit->set_parameter(copybit, COPYBIT_PLANE_ALPHA, planeAlpha);
+
+ copybit->set_parameter(copybit, COPYBIT_DITHER,
+ (enables & GGL_ENABLE_DITHER) ? COPYBIT_ENABLE : COPYBIT_DISABLE);
+
+ clipRectRegion it(c);
+ copybit->stretch(copybit, &dst, &src, &drect, &srect, &it);
+ return true;
+}
+
+/*
+ * Try to draw a triangle fan with copybit, return false if we fail.
+ */
+bool drawTrangleFanWithCopybit_impl(ogles_context_t* c, GLint first, GLsizei count) {
+ if (! checkContext(c)) {
+ return false;
+ }
+
+ c->arrays.compileElements(c, c->vc.vBuffer, 0, 4);
+ // Is the result a screen aligned rectangle?
+ int sx[4];
+ int sy[4];
+ for (int i = 0; i < 4; i++) {
+ GLfixed x = c->vc.vBuffer[i].window.x;
+ GLfixed y = c->vc.vBuffer[i].window.y;
+ if (x < 0 || y < 0 || (x & 0xf) != 0 || (y & 0xf) != 0) {
+ return false;
+ }
+ sx[i] = x >> 4;
+ sy[i] = y >> 4;
+ }
+
+ /*
+ * This is the pattern we're looking for:
+ * (2)--(3)
+ * |\ |
+ * | \ |
+ * | \ |
+ * | \|
+ * (1)--(0)
+ *
+ */
+ int dx[4];
+ int dy[4];
+ for (int i = 0; i < 4; i++) {
+ int i1 = (i + 1) & 3;
+ dx[i] = sx[i] - sx[i1];
+ dy[i] = sy[i] - sy[i1];
+ }
+ if (dx[1] | dx[3] | dy[0] | dy[2]) {
+ return false;
+ }
+ if (dx[0] != -dx[2] || dy[1] != -dy[3]) {
+ return false;
+ }
+
+ int x = sx[1];
+ int y = sy[1];
+ int w = dx[0];
+ int h = dy[3];
+
+ // We expect the texture coordinates to always be the unit square:
+
+ static const GLfixed kExpectedUV[8] = {
+ 0, 0,
+ 0, FIXED_ONE,
+ FIXED_ONE, FIXED_ONE,
+ FIXED_ONE, 0
+ };
+ {
+ const GLfixed* pExpected = &kExpectedUV[0];
+ for (int i = 0; i < 4; i++) {
+ GLfixed u = c->vc.vBuffer[i].texture[0].x;
+ GLfixed v = c->vc.vBuffer[i].texture[0].y;
+ if (u != *pExpected++ || v != *pExpected++) {
+ return false;
+ }
+ }
+ }
+
+ static const int tmu = 0;
+ texture_unit_t& u(c->textures.tmu[tmu]);
+ EGLTextureObject* textureObject = u.texture;
+
+ GLint tWidth = textureObject->surface.width;
+ GLint tHeight = textureObject->surface.height;
+ GLint crop_rect[4] = {0, tHeight, tWidth, -tHeight};
+
+ const GGLSurface& cbSurface = c->rasterizer.state.buffers.color.s;
+ y = cbSurface.height - (y + h);
+
+ return copybit(x, y, w, h, textureObject, crop_rect,
+ COPYBIT_TRANSFORM_ROT_90, c);
+}
+
+/*
+ * Try to drawTexiOESWithCopybit, return false if we fail.
+ */
+
+bool drawTexiOESWithCopybit_impl(GLint x, GLint y, GLint z,
+ GLint w, GLint h, ogles_context_t* c)
+{
+ // quickly process empty rects
+ if ((w|h) <= 0) {
+ return true;
+ }
+
+ if (! checkContext(c)) {
+ return false;
+ }
+
+ static const int tmu = 0;
+ texture_unit_t& u(c->textures.tmu[tmu]);
+ EGLTextureObject* textureObject = u.texture;
+
+ return copybit(x, y, w, h, textureObject, textureObject->crop_rect,
+ 0, c);
+}
+
+} // namespace android
+
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