BLADERUNNER: First pass at slice animation renderer

Z-buffers are not being read from the VQA background yet, so z-buffer
handling is faked for now.

1 files changed, 412 insertions, 0 deletions

diff --git a/engines/bladerunner/slice_renderer.cpp b/engines/bladerunner/slice_renderer.cpp
new file mode 100644
index 0000000000..e8e3ecf894
--- /dev/null
+++ b/engines/bladerunner/slice_renderer.cpp
@@ -0,0 +1,412 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "bladerunner/slice_renderer.h"
+
+#include "bladerunner/bladerunner.h"
+#include "bladerunner/slice_animations.h"
+
+#include "common/debug.h"
+#include "common/memstream.h"
+#include "common/rect.h"
+#include "common/util.h"
+
+namespace BladeRunner {
+
+#if 0
+void dump(const char *str, Vector3 v) {
+	debug("%s %g %g %g", str, v.x, v.y, v.z);
+}
+
+void dump(const char *str, Matrix3x2 m) {
+	debug("%s", str);
+	debug("%11.6g %11.6g %11.6g", m(0, 0), m(0, 1), m(0, 2));
+	debug("%11.6g %11.6g %11.6g", m(1, 0), m(1, 1), m(1, 2));
+}
+
+void dump(const char *str, Matrix4x3 m) {
+	debug("%s", str);
+	debug("%11.6g %11.6g %11.6g %11.6g", m(0, 0), m(0, 1), m(0, 2), m(0, 3));
+	debug("%11.6g %11.6g %11.6g %11.6g", m(1, 0), m(1, 1), m(1, 2), m(1, 3));
+	debug("%11.6g %11.6g %11.6g %11.6g", m(2, 0), m(2, 1), m(2, 2), m(2, 3));
+}
+#endif
+
+SliceRenderer::~SliceRenderer() {
+}
+
+void SliceRenderer::setView(const View &view) {
+	_view = view;
+}
+
+void SliceRenderer::setupFrame(int animation, int frame, Vector3 position, float facing, float scale) {
+	_animation = animation;
+	_frame = frame;
+	_position = position;
+	_facing = facing;
+	_scale = scale;
+
+	_sliceFramePtr = _vm->_sliceAnimations->getFramePtr(_animation, _frame);
+
+	Common::MemoryReadStream stream((byte*)_sliceFramePtr, _vm->_sliceAnimations->_animations[_animation].frameSize);
+
+	_frameFront.x      = stream.readFloatLE();
+	_frameFront.y      = stream.readFloatLE();
+	_frameSliceHeight  = stream.readFloatLE();
+	_framePos.x        = stream.readFloatLE();
+	_framePos.y        = stream.readFloatLE();
+	_frameBottomZ      = stream.readFloatLE();
+	_framePaletteIndex = stream.readUint32LE();
+	_frameSliceCount   = stream.readUint32LE();
+
+	calculateBoundingRect();
+}
+
+Matrix3x2 SliceRenderer::calculateFacingRotationMatrix() {
+	assert(_sliceFramePtr);
+
+	Matrix4x3 viewMatrix = _view._sliceViewMatrix;
+	Vector3 viewPos = viewMatrix * _position;
+	float dir = atan2f(viewPos.x, viewPos.z) + _facing;
+	float s = sinf(dir);
+	float c = cosf(dir);
+
+	Matrix3x2 rotation( c, -s, 0.0f,
+	                    s,  c, 0.0f);
+
+	Matrix3x2 viewRotation(viewMatrix(0,0), viewMatrix(0,1), 0.0f,
+	                       viewMatrix(2,0), viewMatrix(2,1), 0.0f);
+
+	return viewRotation * rotation;
+}
+
+void SliceRenderer::calculateBoundingRect() {
+	assert(_sliceFramePtr);
+
+	_minX = 0.0f;
+	_maxX = 0.0f;
+	_minY = 0.0f;
+	_maxY = 0.0f;
+
+	Matrix4x3 viewMatrix = _view._sliceViewMatrix;
+
+	Vector3 frameBottom = Vector3(0.0f, 0.0f, _frameBottomZ);
+	Vector3 frameTop    = Vector3(0.0f, 0.0f, _frameBottomZ + _frameSliceCount * _frameSliceHeight);
+
+	Vector3 bottom = viewMatrix * (_position + frameBottom);
+	Vector3 top    = viewMatrix * (_position + frameTop);
+
+	top = bottom + _scale * (top - bottom);
+
+	if (bottom.z < 0.0f || top.z < 0.0f)
+		return;
+
+	Matrix3x2 facingRotation = calculateFacingRotationMatrix();
+
+	Matrix3x2 m4(_view._viewportDistance / bottom.z,  0.0f, 0.0f,
+	                                           0.0f, 25.5f, 0.0f);
+
+	Matrix3x2 m2(_frameFront.x,          0.0f, _framePos.x,
+	                      0.0f, _frameFront.y, _framePos.y);
+
+	_field_109E = m4 * (facingRotation * m2);
+
+	Vector4 B6(_view._viewportHalfWidth   + top.x / top.z * _view._viewportDistance,
+	           _view._viewportHalfHeight  + top.y / top.z * _view._viewportDistance,
+	           1.0f / top.z,
+	           _frameSliceCount * (1.0f / top.z));
+
+	Vector4 C2(_view._viewportHalfWidth   + bottom.x / bottom.z * _view._viewportDistance,
+	           _view._viewportHalfHeight  + bottom.y / bottom.z * _view._viewportDistance,
+	           1.0f / bottom.z,
+	           0.0f);
+
+	_field_10B6.x = B6.x;
+	_field_10B6.y = B6.y;
+	_field_10B6.z = B6.z;
+	_field_10C2.x = C2.x;
+	_field_10C2.y = C2.y;
+	_field_10C2.z = C2.z;
+	_field_10CE   = B6.w;
+	_field_10D2   = C2.w;
+
+	Vector4 delta = C2 - B6;
+
+	if (delta.y == 0.0f)
+		return;
+
+	/*
+	 * Calculate min and max Y
+	 */
+
+	float screenMinY =   0.0f;
+	float screenMaxY = 479.0f;
+
+	if (B6.y < screenMinY) {
+		if (C2.y < screenMinY)
+			return;
+
+		float f = (screenMinY - B6.y) / delta.y;
+		B6 = B6 + f * delta;
+	} else if (B6.y > screenMaxY) {
+		if (C2.y >= screenMaxY)
+			return;
+
+		float f = (screenMaxY - B6.y) / delta.y;
+		B6 = B6 + f * delta;
+	}
+
+	if (C2.y < screenMinY) {
+		float f = (screenMinY - C2.y) / delta.y;
+		C2 = C2 + f * delta;
+	} else if (C2.y > screenMaxY) {
+		float f = (screenMaxY - C2.y) / delta.y;
+		C2 = C2 + f * delta;
+	}
+
+	int bbox_min_y = (int)MIN(B6.y, C2.y);
+	int bbox_max_y = (int)MAX(B6.y, C2.y) + 1;
+
+	/*
+	 * Calculate min and max X
+	 */
+
+	Matrix3x2 mB6 = _field_109E + Vector2(B6.x, 25.5f / B6.z);
+	Matrix3x2 mC2 = _field_109E + Vector2(C2.x, 25.5f / C2.z);
+
+	float min_x =  640.0f;
+	float max_x =    0.0f;
+
+	for (float i = 0.0f; i <= 256.0f; i += 255.0f)
+	{
+		for (float j = 0.0f; j <= 256.0f; j += 255.0f)
+		{
+			Vector2 v1 = mB6 * Vector2(i, j);
+
+			min_x = MIN(min_x, v1.x);
+			max_x = MAX(max_x, v1.x);
+
+			Vector2 v2 = mC2 * Vector2(i, j);
+
+			min_x = MIN(min_x, v2.x);
+			max_x = MAX(max_x, v2.x);
+		}
+	}
+
+	int bbox_min_x = MIN(MAX((int)min_x,     0), 640);
+	int bbox_max_x = MIN(MAX((int)max_x + 1, 0), 640);
+
+	_field_10B6.x = B6.x;
+	_field_10B6.y = B6.y;
+	_field_10B6.z = B6.z;
+	_field_10C2.x = C2.x;
+	_field_10C2.y = C2.y;
+	_field_10C2.z = C2.z;
+	_field_10CE   = B6.w;
+	_field_10D2   = C2.w;
+
+	_minX = bbox_min_x;
+	_minY = bbox_min_y;
+	_maxX = bbox_max_x;
+	_maxY = bbox_max_y;
+}
+
+struct SliceLineIterator {
+	int _field_00[2][3];
+	int _field_18;
+	int _field_1C;
+
+	float _field_20;
+	float _field_24;
+	float _field_28;
+	float _field_2C;
+	float _field_30;
+	float _field_34;
+	int   _field_38;
+	int   _field_3C;
+
+	void setup(float arg_1,  float arg_2,  float arg_3,
+	           float arg_4,  float arg_5,  float arg_6,
+	           float arg_7,  float arg_8,
+	           Matrix3x2 arg_9);
+	float line();
+	void advance();
+};
+
+void SliceLineIterator::setup(
+	float arg_1,  float arg_2,  float arg_3,
+	float arg_4,  float arg_5,  float arg_6,
+	float arg_7,  float arg_8,
+	Matrix3x2 arg_9)
+{
+	_field_18 = (int)arg_5;
+	_field_1C = (int)arg_2;
+
+	float var_3 = arg_2 - arg_5;
+
+	if (var_3 <= 0.0f || arg_6 <= 0.0f)
+		_field_3C = _field_1C + 1;
+
+	_field_20 = arg_6;
+	_field_24 = (arg_3 - arg_6) / var_3;
+	_field_2C = (arg_7 - arg_8) / var_3;
+	_field_28 = arg_8 - (arg_5 - floor(arg_5) - 1.0f) * _field_2C;
+
+	_field_30 = arg_4;
+	_field_34 = (arg_1 - arg_4) / var_3;
+	_field_38 = (int)((25.5f / var_3) * (1.0f / arg_3 - 1.0f / arg_6) * 64.0);
+	_field_3C = _field_18;
+
+	float var_54 =         _field_30;
+	float var_55 = 25.5f / _field_20;
+
+	Matrix3x2 translate_matrix = Matrix3x2(1.0f, 0.0f, var_54,
+	                                       0.0f, 1.0f, var_55);
+
+	Matrix3x2 scale_matrix = Matrix3x2(65536.0f,  0.0f, 0.0f,
+	                                       0.0f, 64.0f, 0.0f);
+
+	arg_9 = scale_matrix * (translate_matrix * arg_9);
+
+	for (int r = 0; r != 2; ++r)
+		for (int c = 0; c != 3; ++c)
+			_field_00[r][c] = arg_9(r, c);
+}
+
+float SliceLineIterator::line() {
+	float var_0 = 0.0f;
+
+	if (_field_20 != 0.0f)
+		var_0 = _field_28 / _field_20;
+
+	if (var_0 < 0.0)
+		var_0 = 0.0f;
+
+	return var_0;
+}
+
+void SliceLineIterator::advance() {
+	_field_20 += _field_24;
+	_field_28 += _field_2C;
+	_field_30 += _field_34;
+	_field_3C += 1;
+	_field_00[0][2] += (int)(65536.0f * _field_34);
+	_field_00[1][2] += _field_38;
+}
+
+static
+void setupLookupTable(int t[256], int inc) {
+	int v = 0;
+	for (int i = 0; i != 256; ++i) {
+		t[i] = v;
+		v += inc;
+	}
+}
+
+void SliceRenderer::drawFrame(Graphics::Surface &surface) {
+	assert(_sliceFramePtr);
+
+	SliceLineIterator sliceLineIterator;
+	sliceLineIterator.setup(
+		_field_10C2.x, _field_10C2.y, _field_10C2.z,
+		_field_10B6.x, _field_10B6.y, _field_10B6.z,
+		_field_10D2, _field_10CE, // 2 floats
+		_field_109E              // 3x2 matrix
+		);
+
+	setupLookupTable(_t1, sliceLineIterator._field_00[0][0]);
+	setupLookupTable(_t2, sliceLineIterator._field_00[0][1]);
+	setupLookupTable(_t4, sliceLineIterator._field_00[1][0]);
+	setupLookupTable(_t5, sliceLineIterator._field_00[1][1]);
+
+	int frameY = sliceLineIterator._field_18;
+
+	uint16 *frameLinePtr = (uint16*)surface.getPixels() + 640 * frameY;
+
+	while (sliceLineIterator._field_3C <= sliceLineIterator._field_1C) {
+		_c3 = sliceLineIterator._field_00[0][2];
+		_c6 = sliceLineIterator._field_00[1][2];
+
+		float sliceLine = sliceLineIterator.line();
+
+		if (frameY >= 0 && frameY < 480)
+			drawSlice((int)sliceLine, frameLinePtr);
+
+		sliceLineIterator.advance();
+		frameY += 1;
+		frameLinePtr += 640;
+	}
+}
+
+void SliceRenderer::drawSlice(int slice, uint16 *frameLinePtr) {
+	if (slice < 0 || slice >= _frameSliceCount)
+		return;
+
+	SlicePalette &palette = _vm->_sliceAnimations->getPalette(_framePaletteIndex);
+
+	byte *p = (byte*)_sliceFramePtr + 0x20 + 4 * slice;
+
+	uint32 polyOffset = READ_LE_UINT32(p);
+
+	p = (byte*)_sliceFramePtr + polyOffset;
+
+	uint32 polyCount = READ_LE_UINT32(p);
+	p += 4;
+
+	int zbufLinePtr[640];
+	for (int i = 0; i != 640; ++i)
+		zbufLinePtr[i] = 65535;
+
+	while (polyCount--) {
+		uint32 vertexCount = READ_LE_UINT32(p);
+		p += 4;
+
+		if (vertexCount == 0)
+			continue;
+
+		uint32 lastVertex = vertexCount - 1;
+		int lastVertexX = MAX((_t1[p[3*lastVertex]] + _t2[p[3*lastVertex+1]] + _c3) >> 16, 0);
+
+		int previousVertexX = lastVertexX;
+
+		while (vertexCount--) {
+			int vertexX = CLIP((_t1[p[0]] + _t2[p[1]] + _c3) >> 16, 0, 640);
+
+			if (vertexX > previousVertexX) {
+				int vertexZ = (_t4[p[0]] + _t5[p[1]] + _c6) >> 6;
+
+				if (vertexZ >= 0 && vertexZ < 65536) {
+					for (int x = previousVertexX; x != vertexX; ++x) {
+						if (vertexZ < zbufLinePtr[x]) {
+							frameLinePtr[x] = palette[p[2]];
+							zbufLinePtr[x] = (int16)vertexZ;
+						}
+					}
+				}
+			}
+			p += 3;
+			previousVertexX = vertexX;
+		}
+	}
+}
+
+} // End of namespace BladeRunner